We will need them both at MLB this year. Welter is a senior and will probably start in the opener, but I expect Beckwith to perhaps get as much or more playing time. Welter will be needed making the calls and recognizing the plays versus a complicated spread offense against Auburn and the like and he's better in pass defense. But Beckwith will be needed against power running games like Wisconsin.
He might have gained a few pounds but just a few, his body type is what it is. But he won't be asked to go over the middle in front of the safeties I'd guess.