Well, there are tiers of centers and they do not neatly align with the round numbers. I am pretty sure that Kessler can become a top 10 center: he will need to become as good or better than Zubac or Allen. I am really not sure if he can enter the top 5: he will need to become better than KAT. But there is another tier, of Sabonis-Adebayo-Porzingis and that would be top 7.
Also, there is also the top-2 tier of centers, with Wemby and Jokic (formerly, Jokic and Embiid). I think we all agree that Kessler will never reach it.
I like it, you back up nonsense with word salad. stop drooling on the ****ing keyboard and give it a rest.