I have used converted fb/te with good blocking as guards and had decent success, but I never pulled out all the stops and tried them across the board for the full line. Maybe they can’t hold up at tackle. There’s always been true linemen in most of the starting positions. That said, it doesn’t l always make sense to me as to which players end up being the best LT and such, as I’ve shifted players that are rated more physically impressive and better rated blockers away from the blindside edge rushers for giving up too many sacks, and somehow the seemingly inferior guy holds up better. Maybe it’s pure dumb luck or skill of the opposing threat, but some guys just seem to play better than others. It happens at skill positions too, paper champion underperforms, the guy rated lower goes off…