What I think about the remaining 3rd Strikers joining SSF4T:
Alex - Would probably fit pretty well, has a unique enough moveset to warrant inclusion. Personally don't like him, but I wouldn't complain.
Elena - Would fit with a little reimagining to separate her specials a little more from Cammy .
Necro - Would be the absolute shit, but he'd probably need to be nerfed for 4. Fast, juggling Dhalsim + electricity might be too much for the old characters.
Oro - Would also be awesome, double jumping and tengu stone would wreck house on the old cast.
Sean - I don't think he brings enough to the table, and Abel stole some of his moves anyway.
Yang - Would kick ass, but he's just a better Fei Long in all areas.
Yun - Not actually a great character without Genei Jin, I dn't think he'd fit.
Gill - Fuck it.
Hugo - Would have a lot of trouble without parries.
Urien - NEEDS to be in SSF4T. I don't care how they do it. I don't care if he loses his 5 part juggles as long as the same idea remains. The bouncemaster.
Q - Also needs to be in SSF4T. Would actually fit well as he is, lack of parries and the reduced game speed would actually make him stronger, and wallbounce is already in. Make it happen.
Remy - Would be the most broken shit in existence. Replace Guile with him.
Twelve - Would actually be awesome, but I don't see the team recreating the animations well in 3d.