I think Sitton is a sleeper but not at RT..... he gave up a lot of sacks and pressure for playing very little and at RG. I don't want to see him at RT yet.... but I do think Colledge, Spitz and Sitton will be the starting LG, C and RG.
I'm looking for Hunter or Thompson to step up if Poppinga doesn't at OLB.
Hunter has GREAT skills but he's not willing or knowing how to play physical and I think the new OLB can really help him out with that. And the Packers did try Hunter at OLB in the 4-3 so he knows some LB stuff. Thompson was used in many many different role in college..... in college he's main role was to stop the other teams best weapon (other than WR). He played 2 gap, 1 gap and even bump and run coverage with TEs so he does some about it too.
Also the Packers need the OL or a TE to step up to take it to the next level on offense.... and with both OT positions in question it there might be trouble coming. And they might need both too.... with Colledge, Spitz, Sitton and Finley the talent is there.... it's just will they step it up or not.... and the OT are a big question though still
I also saw a ton of raw skill from CB Lee and he looked like the best kick return guy on the team (not punt but kick) because Blackmon dances to much of kick offs (but does very very well on Punts) and Lee just seem to have more turn than Nelson did. And Lee saw a lot of talent which I think he could give Blackmon a run for his money as the 4th CB.