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http://media.comicvine.com/uploads/4/49256/2460252-ff1998611_cov__scaled_800_large.jpg

vs

Blok
http://media.comicvine.com/uploads/6/67798/2299248-blok____by_chriss2d_d4wiuck_large.jpg
Bouncing Boy
http://media.comicvine.com/uploads/1/11275/347174-167873-bouncing-boy_large.jpg
Element Lad
http://media.comicvine.com/uploads/0/6754/2306041-ddddg_large.jpg
Invisible Kid
http://media.comicvine.com/uploads/0/760/81261-50095-invisible-kid_large.jpg

Even though the Legion are more powerful (slightly), FF would win due to being a better team.

Random Question: If Invisible Kid and Invisible Woman both turned invisible in this fight, would they afterward be able to see each other?

Meaning, because of the nature of their ability, are they able to detect things that are invisible to everyone ELSE?
Has their sight somehow been enhanced to "see" beyond the normal visible human spectrum?