That is obviously when they are returning the service, Paes returns from deuce court, Bhupathi from ad court. I've heard it's usually the better returner who returns from ad court, he returns most BPs.
It's more than who is a better returner to be honest - one could argue that it is important to return the the odd points in a game well so that the team need not get into a break point situation.
For two right-handed players, the one with a stronger backhand will normally take the ad court so that they can confidently return wide balls on that side. I think that works well with the Bhupathi-Paes pairing since most would regard Bhupathi to have the better backhand and Paes to have the better forehand (especially when stepping in to attack the net).
Wont it depend whether its left hander/ right hander? Ex: Consider two left handers playing as a team. Does it change ad and deuce courts?
Another ques, Leander always plays in deuce court and Bhupathi plays always in ad court while receiving the serve
. Always, RIGHT?