Because Unsworth played it against West Ham mate, he was effectively left with not much option after the best result of the season in that game but to keep with it, soon as results tailed off slightly, instantly went to what he wanted to play, trust me if we lost to west ham we'd never have seen Allardyce play it once.
well we'll see if he goes back to it
The line-ups in the last few games haven't been 'defensive' as such, though
they've just been set-up in a stale way that hasn't worked under four managers