I wish him the best, those are mighty big shoes to fill. Hopefully he learned a lot from Greg over the last couple of seasons. Do remember, though, that Greg hasn't always been very healthy and there have been opportunities for Thomas to step up.
We've seen a few flashes, but just a few, in some very imperfect seasons. Yet, when things get tough and your star players are out, a team needs to be able to lean on their tight end frequently, from blocking to getting the tough yards. Stepping up is tough, hope he can do it.