While all of that is true you left out the horrific decisions Kolb makes. He threw some really questionable passes last season and of course he bailed too soon on several occasions.
One thing I've noticed in watching the replays is that our QBs, like our run game, are streaky. They'll look solid for several throws in a row and then just go off the deep end with poor decisions, wild throws etc. Just like our run game that gets 6 yards, 13 yards, 7 yards and then goes 1,3,-1,0.
Oh he does of course but in the end, Skelton throws INT's at almost twice the rate Kolb does. Him improving in that area is critical to him becoming a viable NFL QB.
As you and others have said the big issue Kolb has beyond staying healthy is stringing together plays to create a drive because of all the negative plays.
One stat I haven't seen but wish someone would keep on QB's is average yards per play, not pass play mind you play period. So if you hand off 3 tiems for 9 yards your yards per play is 3. It would show the value of avoiding negative plays. Guy takes a 12 yard loss on 2nd down and then completes a 12 yard pass on 3rd and 15 and you punt. Yards per play would score those 2 plays as 0, where passer rating or yards per attempt don't adequately punish the QB for losing 12 yards on the prior play.
If Kolb canjust learn to get those balls out earlier either thrown away or ideally find an outlet guy, avoiding those big losses will contribute to more scoring drives.
But at this point I just don't think he can stay healthy, in this system he's going to take hits and when he does, he gets hurt.
I'm not a huge believer in Skelton(obviously) but unless Kolb dramatically improves the last 4 games I'd be pretty unhappy if he's the starter he just hasn't been durable enough.