They'll get some weight on him.... but not too much.

I suspect they'll work over a year or so at getting him in the 225 - 230 range if they don't think it will hurt his speed and amazing athleticism. In other words, kind of Mike Evans size.

And because he's played a hybrid TE/WR role all through college, I suspect that is probably how the Rams envision him over time so they sure don't want to mess with his rare gifts.