BJS is still taller with similar reach to Canelo, I don't think he'd be out of his depth considering he would be going in there to dance around Canelo for 36 minutes, so the lack of power wouldn't be an issue.
I was hoping BJS and Callum would fight, I reckon you could easily hype that up as a PPV event. Fuck throw in Dillian Whyte, get the juice head ringside and that could defo be a PPV event at the 02 in London.