The leadership team that worries me is the one that just posted its best quarter in years.

It finishes its meetings early and clears the agenda without an argument. The CEO reads that as chemistry, the board reads it as proof, and the operating partner moves on to a portfolio company that is on fire.

I read it as the first sign of a plateau.

A number can keep climbing while the team underneath it stops getting better.

A struggling leadership team gets watched closely. The board asks harder questions, the operating partner sits in on more meetings, and the CEO reshuffles the room until something moves, usually inside a single quarter.

A team that is hitting plan gets left untouched instead.

The same members who avoided a hard call in March avoid one in September, and the habit survives because the number next to it went up, not down.

Three straight good meetings start to feel like evidence the team is finally working well together (the board deck agrees, in a nicer font).

Whatever the team let slide on the way up, it keeps letting slide once the win is booked and framed as proof, because nobody with the standing to interrupt that pattern is currently looking for a reason to.

CCL pulled together longitudinal studies covering more than 11,000 teams and found that how a team operates today strongly predicts how it will operate a year from now, unless something disrupts that pattern on purpose.

Its report on senior teams calls the result a plateau, and says strong results can feed it by validating how the team operates until the questions stop (high enough to feel like progress, flat enough to feel safe, in its words).

Conflict was the dynamic most resistant to change in that data, and nearly all of the 12 senior teams CCL reviewed named it as an issue, describing excessive politeness in the room and disagreement routed through side channels afterward.

In HBR, Thomas Keil and Marianna Zangrillo interviewed more than 100 CEOs and senior executives and named both versions: the petting zoo, built on conflict avoidance, and the mediocracy, built on complacency and an unhealthy focus on past success.

Boards have the same gap. In Russell Reynolds research, only 51% of respondents said directors often or always solicit honest feedback from fellow directors, and 69% said they avoid groupthink.

A founder-led shop with three good years running has the identical blind spot.

Revenue is up, the leadership team has not had a real disagreement in a year, and everyone reads the calm as culture.

Calm can also mean five people who stopped checking each other's work once the checking stopped mattering to the number.

The cost of a plateau never lands on the CEO's own scorecard, not at first. It lands on the operating partner who has to walk into a quarterly review, hand over genuinely good numbers, and then argue the team producing them needs disrupting anyway.

That conversation is not on anyone's calendar, not the board's and not the team's own, because nothing looks broken enough yet to justify it.

The partner who starts it anyway is choosing to introduce friction into a story that is going well right now, in front of people who will remember exactly who did it if the next quarter dips for an unrelated reason (one eventually will).

The CEO has to admit the numbers are not proof of health, the team has to accept that winning did not earn it a pass on being challenged, and the board has to sit through a hard meeting with nothing visibly wrong to point at, while everyone resets what counts as evidence.

Why would anyone volunteer for that? Because the alternative is finding out next year, with worse numbers and the same unexamined habits, that the easy moment to fix it already passed.

Put a recurring check-in on the calendar now, while the numbers are still good, and run it like a board meeting rather than a retro.

Pick one person on the leadership team each quarter and give them the job of arguing against whatever the team is doing right now, on the record, regardless of how well it is working.

Measure one thing afterward: did anyone in the room actually change a position because of it, and write the answer down where you will see it next quarter.

If the answer is no twice running, the comfort is costing you more than the dissent would have.

Then keep checking. CCL found that team dynamics revert without sustained effort, and it points to checkpoints at roughly 10, 40 and 80 days to see whether a change is taking hold (one good offsite settles nothing, which will disappoint whoever booked the offsite).

A partner who does this to a winning team looks paranoid for about one quarter. They look right for the three after it.