Neal showed flashes of dominance in his brief time on the field last season. Sure, it may never be shown again, but one can't help but be excited about his future. I don't think he's had a significant history of injuries either. His team mates often mention how incredibly strong he is on Twitter. I'd love to see that translate to the field.
I think Jenkins will still be a productive player for another 3, maybe even 4 seasons. If we could retain him for a fair 3 year contract, I would be all about it. The combination of Raji pushing the middle and Jenkins and Neal swarming the outside is one hell of a nasty D-line. CM3 would have a field day. Sure, we could spend a high draft pick on a player that is largely an unknown entity, or pay the proven guy and use that draft pick elsewhere.
The bridge might already be burnt between Jenkins and our front office even if we wanted to keep him. However, I'm confident that the right numbers on a contract would quickly change his mind. I don't see it happening, but I would be excited if it did.