While this defensive scheme fits his skill set better than some others, it still requires that he grasp the zone coverage scheme and react quickly and automatically. That will take a little time, which is why Rod Marinelli suggested that a rookie may well start at SLB.
Dizon looks quick enough, but hasn't shed blocks particularly well and hasn't always been where he's supposed to be -- and that's against second and third teamers for the most part. He struggled greatly against the Bengal first team OL, the only snaps I saw him get against an opposing 1st OL in two games against CIN and CLE.
There's two big problems here. First, this is the coaching staff that was happy to allow Barrett Ruud to sit behind Shelton Quarles for multiple seasons. Paris Lenon may not be Shelton Quarles, but Dizon may not be Barrett Ruud either. Second, the coaches have been quoted as saying that they don't want three MLBs and that one of the three is likely to become a SLB at some point. You'd think that wouldn't be Dizon, but the coaches didn't specifically say as much.
All of this may look like preseason silliness when Dizon works his way into the mix by midseason or it could be the first symptoms of the things that some have had concerns about from the beginning -- namely, can Dizon translate his speed and collegiate history of being around the ball into an every-down, all-around MLB on Sundays.