Each of them leaving what would be defined as a Group of Six Conference to go to a Power 5 Conference or the NFL. Smith and Strong fired less than five years later and Petrino is fired by school where he was the winningest coach in history after one losing season. FYI, in the last 70 years one Purdue football or basketball coach voluntarily left to take a job elsewhere. Lee Rose spent two years as Head basketball coach 38 years ago, went to a FInal Four and left for South Florida where he lasted six years and never was a head coach again.
That's a lot of typing to dodge the subject.