Grabban didn't play wide so much as play deep. Watch the play off final again, his job was to try and get the ball between the Huddersfield midfield and defence and try and make space/find passes there. Transfermarkt has it as a mix of CF/RW/LW.
(I'll actually admit - there may just be a bit of observation bias on my part - I watched a lot of the games in the run-in i.e. from Leeds at home but can't remember too many in the spell before that. In that end season run, his record there was played 7 (started 3) scored 3 and 2 assists).