That is just a number. I have been progging in PF a lot these days, and I have NEVER seen a party locking in a spot for PCT, maybe because it's also against the ToS too..LOL.
PCT is highly effective in ultimates because of its frequent downtimes and the way it can mitigate those moments by simply painting. PCT would be overpowered if it excelled in every single battle, but it doesn’t.
I love numbers, so let's see more of it :
https://www.fflogs.com/zone/statistics/58?boss=1071
https://www.fflogs.com/zone/statistics/58?boss=1078
PCT is OP, right........