Sam Howell is a below average qb and has him putting up above average stats. Also the KC offense has taken a nose dive replacing him with Nagy as OC. He has championship experience and is a brilliant offensive mind and also has ties with Poles from their KC days. He would turn Fields into a Mahomes lite MVP candidate.
Actually Trestman was a championship winning CFL head coach both before and after the Bears. He had plenty of HC experience but made a few crucial errors in CHI that he couldn’t recover from, such as hiring Mel Tucker and not tossing away some bad apples before the rot set in.