re: So trust the system even with the heisman?

I think that's a bit of an oversimplification. It seemed that way mainly because those positions allow an already outstanding player to appear even more so.

The issue I have is that most voters appear to believe the most outstanding player can only come from a team in contention for a national title.

A player can be the most outstanding regardless of his team's record. RG3 will, if he wins this year, shatter that tendency.