It doesn't matter how self-centered you are. Just the presence of other good players means that the other team needs to focus on something else besides Kovalchuk.
It's not a coincidence that Kovalchuk had his best year when Hossa, Savard and Bondra were on his team.
I don't disagree entirely, but Bondra didn't do much of anything that year... and more importantly for Kovalchuk; the NHL called 10,000 additional penalties that year, he got 2 1/2 more PP mins per game than he did last season and scored 56 PP points (his 2nd best total is 33 PP points).
what is amazing about hossa is how he's playing. he looks the same regardless of linemates. 13 of his 15 goals are ES.
he's playing with incredible determination. he might actually be too driven--sometimes he's a bit out of control. he has a large number of offensive zone and neutral zone penalties.
imo, he's actually harming the overall team play (but not the offense), b/c he doesn't play the same style as his linemates, so the unit is out of sync, and DRW's puck possession style (which is as important for defense as it is for offense) is not nearly as effective.