Haha, his full name is Wizard, because of that beard! He's had it since he was a wee little thing, it's kind of his icon now and I can't bring myself to trim it.
I personally see pit in your pup, something about the way he holds himself and the angles of his cheeks and forehead, but then you never really know. Pits around here tend to be a bit on the leaner side, my aunt had a full blooded pup who was wide barreled, but otherwise lean but sturdy. I wouldn't say your boy has a STRONG pit influence though, probably his daddy was half and mixed with something else. My boy came from a lab/poodle daddy and a lab/pit momma, so it isn't surprising the lab is the most dominant trait... with the others just throwing little wild card perks into the mix
I wouldn't be the least bit surprised if that was your boys case as well.
Nevertheless, he seems so lovely, I'm sure he'll be an amazing dog for you! I prefer lab/mixes to most other dogs when looking in the shelters... they just seem to make such wonderful lil mutts, bahaha.