Well playing for knights he will have had to tackle more than other fullbacks. He had to make 70 tackles in the 13 games he played .....but he did miss almost 1 tackle for every 2 he made last season. He missed 30. Of course those numbers don't tell the whole story. If a fullback is good at positioning himself he gets more opportunities to make tackles- if he's bad at it he doesn't get close so he doesnt accrue a "missed tackle" I reckon Connor got away with a few of those!
Thing is your fullback should rarely need to make a tackle if everyone else does their job! I'm more interested in whether he can create chances than make tackles- will have to wait and see.