You're certain this is how it works?
They aren't going to count his sacks, tackles, etc, towards his goals if he's playing at DT or RE?  or LB?  That seems a bit ridiculous.  A TE won't have his stats counted if he lines up at FB or WR spots?  Or a RB won't get stats if lined up as a WR?  Etc?
Prove it.
http://www.e-athlete.net/gallery/image/301-goals-2-xp/
Where in this image does it specify anything like that?
You spend too much time arguing with tin foil hat wearing children on OS.