An undisclosed injury has seen Mitch Gagnon pull out of his UFC 158 bout with Issei Tamura. The Canadian will be replaced by TUF 14 finalist T.J. Dillashaw, the two bantamweights will meet on the Facebook preliminary portion of the card.  Tamura (7-3) is 1-1 inside the eight-sided cage. The Japanese fighter is coming off […]