After his entire ordeal with Fischer he got blackballed. Floating story has always been that something bad went down behind the scenes but noone will say what.
And what makes you say he can't play? He was successful in Tennessee (by Titans standards).
TD–INT 46–51
Passing yards 8,964
Passer rating 74.4
Rushing yards 1,459
Rushing attempts 282
Rushing touchdowns 12
He's a fighter. He had crap for tools in TENN (like most who play there) but still won. Hell he's arguably the most successful TENN QB since McNair.
AFC South Champ in 08 and made the playoffs in 07 and 08.
Better than RG3, Vick, and Johnny Douche that play now with similar skill set comparison.