Weber's AD has explicitly stated that Weber is coming back next year. They said that they are pretty much ignoring this year due to CV and injuries.
I do not expect Groce to ever coach at a P5 school again. I don't see him succeeding at any level above "we play hoops because we enjoy it." He was exposed pretty badly. His game plans and in-game coaching were horrendous. His one skill seems to be that everyone likes him, especially moms. That is great for remaining on the list. It isn't a real qualification for a recruit that is trying to make basketball their career. It will win many non-career basketball recruiting battles.
Respectfully disagree on your conclusion on Groce. If he keeps having success in the MAC and gets a tournament heater, he will absolutely have another P5 team knock on his door.
The reason I disagree is it's also possible that he learned from his stint here at Illinois, continues to improve on the X's and O's, and fills his staff with personnel to help round out offset his weaknesses. I'd say there's a pretty high chance Groce is still here if Holtmann doesn't get the Gardner Webb job. A coaching staff with Holtmann and Brandon Miller on it would have really helped with schemes and talent development.
All that being said, I wouldn't mind if he was able to leverage the Akron/LeBron relationship and build the Zips into a perennial top 25 team.