Could the ninjas withstand Gill's Seraphic Wing or Meteor Storm? Or how about Urien's Tyrant Slaughter or the cheap-ass Aegis Reflector corner combo?
Ryu's invulnerable while executing Karma techniques, and depending on the radius of those attacks, they can simply teleport out of harm's way. I don't see any of the Street Fighters posing a threat against the True Dragon Sword or the DDB for that matter.
Oro fights with one hand tied behind his back because should he uses both hands, he could kill his opponent. Gen is a trained assassin with a deathwish.
I find it very easy for Ryu to kill any opponent from SF.
And everybody knows Bison's track record, not to mention that Bison's Ler Drit style combined with his Psycho Power is indeed dangerous.
Omega is said to have unprecedented capabilities. He can create shockwaves, shoot energy blasts out from his body, shoot flames at his opponents, and has a double-edged energy saber. ALPHA-152 is a pretty fierce opponent since she is the most powerful creation of DOATEC.
Vega is a sadistic freak who would love nothing more than to slice Kasumi and Ayane into ribbons. Sagat already killed Go Hibiki in a match. And Bison has Juli, Juni and Cammy on his side, and all three have killed before.
I don't see Vega posing a threat to either Ryu, Hayate, ALPHA-152, Genra, Omega, or Spartan-468.
Raidou managed to steal the Sky Torn Blast, but what good will that move will be against the Raging Demon, or the Superchop (both Third Strike and CvSNK2 version).
What about Ryu's Karma techniques? Also, I don't see any of the Street Fighters surviving once Ryu summons a soul of a Black Dragon to come and kill them.
I have to second what Remulous said. The four ninjas are the only credible threat on the DOA roster because Itagaki wanted them to be dangerous.
No, that's wrong.
More than likely, if Team Ninja attacked Gill, he just uses the Seraphic Wing to deal massive damage on all of them.
Inazuma would severely injure just about anyone from SF. Also, Ayane's attack, while it takes time, can still be executed as long as some of the Street Fighters are distracted. i.e., ALPHA-152 attacking everyone at the same time. That's just how fast she is. With the DDB, Ryu could create magical shurikens out of thin air and send them at the cast of SF. Omega's shockwaves, etc. So, Ayane's attack can deal massive damage as the Seraphic Wing can. Anyway, I see DOA having a bigger chance of winning in a deathmatch.