How can he have all the "tools" if you've only seen him kick box or do sanshou? I've seen his fight with Altman, and while he does a lot of nice flashy moves, I'd have to say that stuff isn't going to work against a good opponent. And I'd like to see him against a decent ground fighter to see how well he does there.
I've only seen one of his fights in Sanshou. He fought a hopeless opponent. I imagine that K-1 might be a stepping stone for now. He will need to learn what to do once the fight goes to the ground because both K-1 and Sanshou stop the fight once the fighter goes down. Those scissor kicks look sweet but I don't think they do any damage. However, in UFC or Pride he would be able to follow up with maybe some heel kicks to the midsection or even head. I think that the risk of getting caught in a kneebar would be too much to try the move in MMA. I hope that we do get to see him in true MMA though. He is hella fast.
Cung Le does fight in Frank Shamrock's Strikeforce organization.
Actually, I've seen fights where Cung Le has knocked people out with his scissor's leg takedown by dropping them on the back of their heads. He can easily use that to transition to a leg lock, like Ryo Chounan's submission on Anderson Silva (leg scissors to reverse heel hook).
He does need to get in there with better fighters to get his ground work tested. He's won quite a few Sabaki challenge matches with submission.