Certainly along the interior. Allen is going to be pushing for that center position in camp next year, and has looked good when he's been in there. I think the reason he's not challenging Sully yet is the expertise with which Sully makes those line calls but on the physicality side of things Allen's a brawler. Boom is certainly capable as a backup OG.
Only non-replaceable dude on the OL is Big Whit. I am not sure Boom can go in there at LT and play well enough to keep Goff's confidence.