EA should implement a new chemistry rating for team and individual players in Live 2005. Poor chemistry ratings would affect ratings for the individual and his teammates. And the chemistry rating should fluctuate when a player moves from one team to the next. Some players might have higher chemistry ratings when they are the number one offensive option but when they move to another team and become the second option, his chemistry lowers, which affects his play and team play. First or second option would be determined by the primacy rating.
Coaches could also have a chemistry rating. Coaches with lower chemistry rating would adversely affect a team's play and some coaches would have arguments with other players with low chemistry ratings. Maybe have players skip practices and miss games with coaches with low chemistry ratings - something that adds more realism to dynasty mode. You might want to train a particular player and u pay for the training coach, but the player doesn't show up.
Other wishes:
On another note, they should return the clutch rating and fix up the numerous statistical bugs that are in the game. (Blocks aren't properly accounted for as Missed Field Goals, Steals defected out of bounds are considered Turnovers, Blk shots turning into FGM are considered assists)Also they should separate additional OT's statistically. If I play 2 or 3 overtimes in a game, I don't want to see the stats of all three OT's under "Overtime", I want to see them separately as "First Overtime", "Second Overtime", and "Third Overtime."
In addition, the stats they show in while you play the game don't show OT stats. IE scoring would just show First Half and Second Half. They should also show Overtime stats where applicable.