We did the same thing with Hocker and lived to regret it.
You can go with an unknown like Grupe. But you have to live with the downsides. We have no idea how Grupe handles the hht lights or the pressure kicks. We also don't know if he has the mental toughness to get through a slump.
The biggest issues for kickers is their ability to manage and navigate their confidence when they're in a slump. Some guys never regain their confidence and some guys are never the same again once they hit that wall.
Look at Gillikan for example. He had a monster 2021 and we thought he was going to be better than Morestead but came back down to earth a bit last season. Consistency is hard to find and it's impossible to gauge in a practice/preseason setting. When you find it, you hold on to it.