I don't get where this sudden narrative that Freeman is a Tressel ball coach comes from. The guy plays heavy risk/reward defensive schemes that put corners on islands, loves trick plays on special teams, loves going for it on 4th down even in his own territory, and has made no bones that he wants to beat teams badly if he can. His entire mantra is "challenge everything."
BK was the conservative one. His whole strategy post 2016 was "I'm going to get up by 10-14 points and then turtle up because I don't think you can score". (Which is fine, but definitely more conservative than how Freeman coaches.)