It is quite comical to see IDS complaining that the govt have been hurting the poor and the vulnerable. Well, yes, you could say that. It makes me think that there is more going on than disability benefits - well, obviously. A power struggle, I suppose.
If Remain win the referendum, then IDS was probably for the chop in any case, so he has jumped before being pushed. If Leave win, presumably, IDS will be a top man.