This argument doesn't add up--many others have already sniffed it out. Kirk said Fant didn't play (i.e. only six snaps in second half of Penn State game) because he didn't fit the scheme. When you have a player as dynamic as Fant, you adjust the scheme and get him in there--at TE, Wideout, H-back, wherever. To not have him on the field was a crime and it wasn't because "he didn't fit the scheme"--that's thinly veiled Kirk-talk.
I don't think it was just Fant's brother who said things...I'm sure Fant expressed his discontent too--this is probably what got him cuffed.