There is some built in bias to the poll though.
Oscar's question/poll is coming off 2 sub standard seasons from a results standpoint and on the heels of now a 7 year (6 chances) FF draught.
To put it this way, if the poll was posted in 2015 I highly doubt you have the same responses.
Your observation is correct, but I believe your conclusion might miss. Of course, Cal would get a higher vote if taken in 2015, there was no reason to believe anything would change back then.
But more information is always a good thing when trying to make an informed decision. Now we have more information on Cal's tenure and we have seen that it is going the wrong way, so we know we wouldn't want that again if we had a choice, so we would make a more informed decision.
Example: if you are served a meal 4 nights in a row, the first two of them are ok, the next one is great, but you didn't get enough, and the last one is great. You are asked to judge them immediately after finishing the 4th meal and you would choose number 4. However, the next day you come down with food poisoning from the 4th meal. Then, 7 days later, you are asked to judge them again. You would definitely not choose the 4th meal again.
So, after 7 additional years to judge Cal, most people have decided the short term satisfaction of his first 5 years isn't worth the vomiting that followed in the last 7 years since then!
Personally, I still would have chosen Pitino even after Cal's successful run if you had asked me back in 2015 - the success was very similar, but I liked the way Pitino won better with players that stayed longer and especially because it was a more exciting way to play on both ends of the court. I always believed Pitino's system could win even without having the top 10 recruits every year. We know that isn't true of Cal's system.
There were a few things Pitino was hard headed on, a few things he wasn't the best at doing, and he talked down to us too, but if you are winning, that can be overlooked, just like it was with Cal when he was winning.
Of course, after learning about some of P's personal downfalls, I don't support his off court antics - I probably shouldn't admit it out loud, but I would probably overlook them to have him back in his prime.
That kind of thinking let Crean coach at IU for 5 years too long