Not looking out of place in 7 minutes of fourth line play doesn't make Hoffman NHL-ready, how on earth people could get 'good' out of his 7 minutes I'll never know... Zibanejad is certainly above him, especially if we're only talking about for these playoffs, Petersson too even.
I watched a lot of bingo games this year and from what I saw the Hoff was consistently Bingo's best forward for much of this year. He runs the point on the PP down there and is a pretty dangerous player on the rush with his quick release and skating. Da Costa had a decent run of games before fading off after the 10 game or so mark, and Hoffman is a bit better than him. The upside is that he's used to playoff hockey playing with the Voltigeur, See Dogs and last year's Calder Cup champs.