I'm amazed that the fall from grace of Berahino is being blamed on the management/coaching staff but I suppose its just any old excuse to have a pop at them as it seems to be the popular thing to do these days.
He's got absolutely no one to blame but himself in my opinion. Saido was the only one that allowed his head to be turned and reacted very badly when he didn't get his big move and he was the only one that let his fitness levels drop dramatically in the fallout from that costing himself nearly a season of development.
Saido is responsible for his current situation where his star is rapidly fading to the point he might not get the move he wants. During the first half of the season there was a chicken and egg situation where he wasn't match fit but wasn't getting playing time so couldn't get match fit.
Equally fitness is always TP's response when asked about a player he's not playing they aren't match fit, up to speed etc... It's a line that has been trotted out for McManaman Gnabry,Pritchard, Berahino and Chester at various times, now it might be true but I think it is TP's stock response to the question because if the player isn't fit it is reasonable not to play them it closes the discussion down.
However now that Berahino is getting a run of games there is no excuse for the fairly mediocre displays that we are seeing. His heart isn't in it he desperately does not want to get injured and the end of the season can't come quick enough.