I don't know if we can count on Boom as a starting LT again. That LT spot requires a lot of agility and he tore his Achilles. More often than not that is a death sentence for a pro athlete.
So, right now, for next year I would count Jackson as our starting LT, Shelton as our LG, Allen at center, Bruss at RG and Havs at RT.
Boom might be able to backup at both the tackle spots and guard spots. Ancrum should be okay to back up these same spots. We will absolutely need a couple of more youngsters to create depth.