Yeah, maybe, it's a bit weird. The general rule is younger blokes start early and older, more experienced bulls get a few extra weeks off. Then again you see Jacko back already today, but he is the captain and he might only be doing one or two early sessions or every second session. Comes back to the club to manage what is best for each player.
I can say though, Thommo has only just come back from holidaying on the Whitsundays. Doubt he has done too much training at all yet. Not really a concern. He is a fitness freak in gerneral and has many seasons under his belt.