The job of the WLB in a 3-4 defense is to get into the backfield. He is the pass rusher. The sack man. He is Lawrence Taylor, Derrick Thomas, Kevin Greene, and Demarcus Ware. He is not a coverage guy, though he may drop into the flat (AND ONLY INTO THE FLAT) a handful of times per game to confuse the QB.
KVN was much more of a jack-of-all-trades LB than a true WLB. Even then, he really only spent significant time in coverage when our DB's were getting abused or were in danger of being abused (vs Eifert for ND or vs Otten for SJSU in 2012 or a LOT of last season, when we were playing short and/or relatively unathletic guys at BCB).
All of these "Bronson will struggle in coverage" comments only show ignorance about how our defense is supposed to work. With legit D-I players at BCB this season, coverage will be a very small part of Bronson's game, unless he is really good at it, in which case we will see a lot of interesting zone blitzes this season.
Just for thoroughness' sake, the SLB is much more of a coverage LB than the WLB. And Fua is as good in coverage as any LB in college football, from what I've seen.