I think Beckwith will be a hybrid LB/DE. While he may line up with a hand in the dirt, he might peel back and play LB, especially against spread offenses. Let's also not forget that both Beckwith and Jones played QB in high school and both might get some wildcat snaps.
Jones wants to compete. So I'm confident he will stay active and keep his weight below 255 upon his arrival at LSU this summer. Very likely he will play MLB at about 245. I've seen him play on both sides of the ball at 245 and shine regardless of all the snaps. He has good speed and agility for a kid his size.
I think MLB is Melvin's destiny. However, as a freshman with such athleticism (proven on the field), to get some playing time he might even get some snaps at TE, and not just to be a blocking TE but also a passing target.
If Jones was not so good at MLB, I could easily imagine him playing FB/TE.
Bottom line: Both Beckwith and Jones are talented athletes, and the coaching staff will use them in ways to help the team. Ditto for Jeryl Brazil.
This post was edited on 2/1 at 4:26 am