First of all, you brought it up. Second, the fact that he did it TWICE at a crap school is a good indicator that he wasn't washed up when he left in 1997. It's very likely that if he could do it at U6, he could do it again at UK. Third, I wasn't saying he would have had the exact same run as he did from 96-98. That's a straw man.
My point about the slight drop off was just to illustrate that this run he had in the 90s was likely going to level off a bit. If Pitino coaches another 6 or 7 years, and say he gets another Final4, but also a few 2nd round losses, maybe a sweet 16, and maybe even an opening upset (all things I think even the GREATEST coaches go through).. does that not bring his overall career at UK down, even just a bit?
If we can say "Pitino wasn't given the same amount of chances as Cal".. my reply is "He also wasn't given the same amount of chances to come up short or have a bad year". It was very very VERY unlikely he was going to go to like 4 or 5 final4's and get another title or two, if he coached another 6-7 years. MAYBE he does, I'm not saying he couldn't. But history and track records show that even the best coaches will have several years in a decade, where they are only a 4 or 5 seed or lose in the opening round. Izzo, K, Self, etc. Pitinios 90's run was highly unlikely to be duplicated.