I'd even go as far as saying that groves wont go further than commonwealth level. Sure he might challenge for the euro title but he will never win it.
Groves would try to turn it into a FOTY, but I suspect DeGale would smash him up into little pieces. I'm high on Groves, but I think there's a very wide gulf between DeGale and Groves. Heck, I think there's a very wide gulf between Gavin and Groves and every other British prospect out there (including guys like Brook and Cleverly, who I also rate ahead of Groves).