Diangana seems a bit lost at the moment, wonder of he's regretting moving, he was very much part of the Bilic project, so he might feel he's made a big mistake with WH riding so high, even if he wouldn't have got much game time with them. But in the champ next season he must surely be given a pretty free rein to do his thing, he will toast most defences in that league (again).
If he hasn't got on with Sam so far, Sam is the adult in the room, up to him to find a way, that's his job.