They targeted Allardyce because it's well known behind the scenes that he's a regular participant in these shanigans. Google "Ravel Morrison agent Allardyce" if you want to scratch the surface.
I have very little sympathy for him, and while he's said little wrong, he's willfully gone past the norms of professional conduct by whoring himself out like a lobbyist.
It's not as if managers who play the "Big Sam way" are in short supply in the British Isles anyway, you could get Steve Bruce in and no one would hardly notice the change