he might lose it to a 4.7 or something like that, but that's still blazing for a defensive end. To make himself a more complete player it would be worth it for sure. Keep in mind he is 6'5".
There are those that are that big(Marcus Spears was a DE and weighed near 300). We really needed some DEs to rush the QB, so don't expect Ben to get too big early.
Little was a safety in highschool believe it or not. He came to UT as a sophomore after a year at junior college and played DE for two years then moved to MLB for his senior year.
I remember it didn't pan out as well as some expected and people were skeptical the next year when Al Wilson went from OLB to MLB...but we all know that panned out much, much, much better