My Greatest Ally, in Theory, Turned Out to Be My Worst Enemy

We are often told that success depends on surrounding ourselves with the right people.

That sounds obvious when we get to choose who joins our circle. But when you inherit a team, that luxury disappears. At least at first, you do not get to choose who is part of the journey.

That is exactly what happened when I became a warehouse manager.

A Promising Duo… on the Surface

Before I officially started, I had several conversations with the supervisor already in place.

He seemed like a good person.

His warehouse management experience complemented my people-focused and structured leadership approach. We often discussed our shared vision for improving both morale and performance.

On paper, we were the perfect duo.

But there was one detail I had overlooked:

He wanted my job.

The Naivety of Trust Given Too Quickly

When I stepped into the role, I chose trust.

I believed we were on the same team.

Yet the warning signs were there:

• He had fought hard for the position before I was selected and had never fully accepted the decision.
• Senior leadership had already needed to make it clear that I was the person in charge.
• A security officer repeatedly warned me: “People say strange things about him. Be careful.”
• My mentor had advised me that I needed to “get rid of that rotten apple”, a warning I either forgot or chose to minimize.

Despite all of that, I continued believing that, like me, he wanted what was best for the team.

I was wrong.

When an Ally Becomes an Adversary

This supervisor, my right-hand man, turned against me.

It was a silent mutiny.

Like the hand in the movie Idle Hands that turns on its owner, my own “right hand” was trying to make me stumble so he could take my place.

I realized it too late.

The Signs That Opened My Eyes

Several months after I took the position, one of my team leaders sat down in my office and confided something important.

My supervisor had been speaking against me.

• He took credit for successful initiatives.
• He blamed me for every unpopular decision.

The second point was the most dangerous.

In front of employees, he would say things such as:

“I would have approved your vacation request, but Carl doesn’t want to.”

“I have no issues with your performance, but Carl thinks your breaks are too long.”

Little by little, he was undermining my authority and building a negative perception of me within the team.

Action Taken… Too Late

I called him into my office for a two-hour conversation.

I clearly explained my expectations:

• Disagreements should be discussed privately, not in front of the team.
• Once a decision is made, he needed to support it as if it were his own.
• If he continued damaging my credibility, I would terminate his employment.

I documented the meeting and shared the notes with Human Resources.

My manager was aware of the situation.

The General Manager was not.

Despite that, only a few weeks later, I learned that I was losing my position.

No warning.

No opportunity to adjust.

No detailed explanation.

And the greatest irony?

That supervisor was appointed to lead the department after my departure.

The Shock

That was the moment I realized I had been sitting on an ejection seat.

Eleven years of sacrifices.

Eleven years of evenings spent at work instead of with my children.

And none of it mattered once internal politics took center stage.

What This Experience Taught Me

This painful experience forced me to revisit my beliefs about trust and leadership.

Here are the key lessons I learned.

1️⃣ Trust Does Not Eliminate the Need for Vigilance

Trust is a strength.

But in a new role, you must first observe, evaluate, and test.

Complete trust should be earned.

That does not mean becoming paranoid.

It means developing discernment.

2️⃣ Political Games Exists

I was focused on operations and people.

I neglected the political side of leadership:

• Alliances
• Hidden ambitions
• Power struggles

Ignoring that reality can put your career at risk.

3️⃣ Document and Escalate Early

I waited too long before taking action.

Today, I know that warning signs should be documented immediately and shared with all relevant stakeholders—including senior leadership.

4️⃣ Protect Your Reputation as Carefully as Your Results

I believed results were enough.

They are not.

Perception matters too.

Every public statement made by a leader contributes to shaping your reputation.

Do not allow others to define it for you.

5️⃣ Never Underestimate Other People’s Ambition

My supervisor wanted my job.

I knew it.

But I assumed loyalty would outweigh ambition.

That assumption was naïve.

When a coveted position is at stake, some people are willing to maneuver behind the scenes.

6️⃣ Give Yourself Permission to Act Faster

Looking back, I should have removed him sooner.

At the very least, I should have reduced his influence immediately.

Failing to act is also a decision.

And often the most costly one.

7️⃣ A Leader Is More Than a Manager of Tasks

A leader is also a guardian of culture and loyalty.

Good processes matter.

But having the right people matters even more.

Conclusion: Between Naivety and Awareness

This story is not an invitation to become cynical or distrustful.

It is a reminder:

Trust is valuable, but it must be paired with strategy and vigilance.

Yes, I still trust people.

Yes, I still believe that most people genuinely want good things for others.

But I have learned to:

• Ask more questions.
• Test intentions before opening the door completely.
• Protect myself and my team from political games.

Because a manager is not only responsible for results and employee well-being.

A manager is also responsible for navigating power dynamics.

So if you are a leader inheriting a team:

• Observe before granting complete trust.
• Document anything that feels suspicious.
• Communicate openly with your leadership team and Human Resources.
• Protect yourself, even while trying to protect others.

Trust remains one of the most important values in leadership.

But like a bridge, it must be built on solid foundations.

Otherwise, it can become the very weapon that leads to your downfall.

Carl-Michael Tessier, M.Sc., MBA
Coach for High-Performance Team Development and Customized Leadership Support