This pretty much sums it up for me.
I agree with what most of what Kedsy said, but I'd add that I think the SF position is, in reality, much less of a question mark than the PG position, and that I don't think Murphy and Jefferson should even be in the same conversation when it comes to skill set and readiness to play SF. Murphy is a stud, a natural wing, and has proven to be a very solid player (albeit not on the big stage) for the past year against top-level college talent. I'm very high on Jefferson too, but he's not a natural wing at all, and is nowhere near as physically ready or experienced at this level. IMO, whether it's acknowledged at this point or not, the SF position is Murphy's, barring something major, and Sulaimon/Jefferson/Hairston will get however many leftover minutes there are, depending on the game.
PG is the most crucial question in my mind. Ideally, it seems like Cook and Thornton should be fine; Cook will hopefully be primed for a breakout year, and Thornton is a steady upperclassman who is basically a 6th-year player for all intents and purposes. In a vacuum, it seems like a good combo to complement the rest of the squad.
But then there's defense, and there's Sulaimon. Playing either Cook or Thornton next to Curry for long stretches could be dangerous, and Sulaimon has to get minutes somewhere. He'll be the first (and really, IMO, only) backup on the wing, and maybe that will be enough. But if he's getting minutes at PG while both Cook and Thornton sit, it would be a pretty huge shakeup. It would be our best defensive lineup, but is it worth playing him out of position and benching two veteran PGs? And would K actually do that?