Interesting you think KSI was the inferior boxer, from an unqualified standpoint it looked like he had good movement/speed, but that Logan simply had too much reach for him to deal with for a long time. KSI has also been trained by an olympic medalist and for a long time, so it would be surprising if he really was the 'inferior' boxer. I was impressed by how good Logan was in the early rounds though, considering he's been training for a very short period of time.
I don't think the 'pro' comments should be taken seriously, it's just a bit of fun, I'm sure he and his trainer know he'd get slapped up against a professional. Maybe he wants to test himself against that though and see if he can 'last' for a decent amount of time.