This 100%, Mack did not turn us down. I want to see the contract details. If Pitino's buyout is on the large side then we have our answer or least part of the answer. That said, I am not sold on Pitino Jr. Mack is a known quantity and Pitino has won tourney games and had a few winning seasons at Minnesota and that is nearly impossible.
I could see a world where GC offered them both the same/similar deals and Pitino Jr. just pulled the trigger first. I could also see a world where Mack insisted on that same low buyout and GC went in a different direction with a hungrier hire.