Mushy should continue as the captain IMHO. He should leave the keeping job. It's too much load for him to do both captaincy and keeping at the same time. As Anamul is in the squad, Anamul should do the keeping. As a result, Mushy will have more time to think about his captaincy job.
Sangakara left keeping when he was made the captain.
And Allah Knows the best