You cannot enforce rules based on opinion which is why this is so daft.
I agree, so why do the FA fine Wolves, Blackpool?
Think about it.........If we dont play Berbatov we are dropping the leagues top scorer. Is that a "weakened" team? If we play him and drop Hernandez who is in the form of his life is THAT a weakened team? Its a judgement call.
Ian Holloway perceived his team to be strong, the FA went purely on the fact that he made 9 or so changes between games, how many will Man UTD make from the Blackburn game?