I´ve said this all season, and even before it started.
I don´t understand this "they both have to play at the same time". They don´t. We perform best with a 4-3-3 type of formation and also add the fact that we have a small squad, so resting one of them at times, only makes sense.
Regarding that they should be able to work together, Ba and him, isn´t true i think. They are both to similar (read selfish), as I said 100 times. They don´t make runs for each either, and if they do, the other one doesn´t even look up.