He doesn't have all that good of history with decisions in title fights, lost both of them (we are talking about 5 round fights, not 3), so that could be telling. I can't, for the life of me remember if it's because of his gas tank or what. However, Cannonier has never fought a fiver rounder to length so let's see who buckles first.
Cannonier is predominately a striker though, and as I've said previously when you match up a striker against a wrestler, it's usually the wrestler that does better. What you tend to see is the striker becomes so wary of the takedown, they stop throwing as much volume as they usually do, then sometimes you even seen the wrestlers out striker the strikers. He may have not done well in the past with decisions, but I do not see him knocking out Cannonier or even getting a finish against him, but for some reason my gut feeling is he's going to win this match up.
Although, I'm not trying to convince anyone to go for Kelvin. I mean the last few championship fights I've got wrong consecutively.