The thing that worries me about number 1 is that I believe all of those guys have missed time due to injury (Bosa was banged up, not sure if he missed time)? With Spence missing a few games due to suspension and with the loss of Jamal Marcus, I am a little worried about depth. I think we will see some young guys getting a lot of game reps. With that said, I still think that that those 4 guys together are better than any 4 guys any team in the country could put together.
In regards to #3, I would have to say push. I think that Samuel will have a huge impact on offense, Raekwon will have a better freshman campaign than Shazier (which is saying a lot) and another freshman will break out at WR (possibly Dixon), OL (possibly Meechy) or DB (Webb, Lattimore or Smith).