GGG would get a KO/TKO at some point. GGG might time him early and finish him or DeGale might frustrate him with his awkwardness for a while before tiring and getting smashed up. Bottom line, DeGale gets stopped.
GGG has the skills and the power in this case however, even at 168. DeGale doesn't really have much going for him besides being a kinda awkward southpaw spoiler. Unless you've seen something that I missed in him?
GGG has got this one by late stoppage. Degale has stagnated with his career. he's not moving forward in any way. he's not polishing up his skills as can be clearly seen. he hasn't yet worked to control someone with the southpaw jab. he moves on the back foot to look pretty, not walk someone into a counter. his ability on the front foot is getting worse. he's leaping in with his shots too much. and he's hitting with the inside of the glove far too much also. the man needs to get himself a new trainer and promoter before it's too late. he has the ability, but he's not being shown how to use it properly. it's quite sad really.
I saw him fight twice. Not impressed at all. Amatuerish. If it looks like a duck, walks like a duck, talks like a duck ----- its a ****in TOMATO CAN.