Well, there's some true there, regarding the BIG SPOILER THING UP THERE. I still don't think Kakashi will be killed, though - sure, Kishimoto might not have a (sorry for the comparision) DBZ-like scale of power in which you can say exactly who is more powerful than who and why.

However, it stays the same for me - four sound ninja, level two, stronger than Sasuke (Sakon defeated Sasuke very, very easily with Sasuke lvl. 1, Sakon might or might had not activated the seal) had trouble defeating two Leaf jounin, and had to rest afterwards. So that means the seal gives you basically strength, speed (possibly) and powers that would be out of your reach, not skill and battle-strategy abilities.

Not only that, it seems that being at lvl. 2 seal uses a lot of energy - Sasuke could just activate lvl. 1 and immediately went to level two, there's no knowing how long he'll really last...

So anyway, I stand by what I said way before... sure, the seal may give Sasuke more strength and some new moves, but Kakashi is the one with experience, and he knows the way Sasuke fights.

'Sides, who better to fight a sharingan user than another sharingan user? And since Sasuke doesn't have the mangekyou yet, its not really dangerous.