There is a player in Souza, no doubt about it. He's strong in the tackle, can protect the back four, and he is strong in the air. All the makings of a wonderful defensive midfielder.
I think he simply doesn't care about Sheffield United. He has little to no connection to the club or the city. Last season, it was evident that he really wasn't trying, and his attitude was horrific, especially towards the end of the season. Add on to this, he doesn't offer anything going forward (other than that Luton away game), and he is not a Premier League quality defensive midfielder. His comments about not feeling out of place at this level are laughable to anyone who has watched a full game of ours this season.