Tyson is the best on one side of the floor, consistently, and is a leader.
Lin is the best on the other side of the floor, consistently, and if he's not leading vocally like Chandler, he may have led this team by example offensively. How many threes does the team take now since he attacks the basket even when having good room for a three? Exactly. A long time I thought this, if I ever become a basketball player, I'd be constantly attacking the basket so my other teammates would.
It's not even a question that they're co-MVP. Without Chandler's defense, would Pau and Bynum have been made into mincemeat (shout out to Jeffries for not making Chandler defend both)?