That is irrelevant. Hoilett, like SO many of our players, has been outstanding this year and so to criticise him for missing a penalty would be foolish, when you consider his superb contribution over the course of the season.
Madine, on the other hand, has contributed almost nothing and so has little good will to call upon. He is a striker bought to score goals - if he fails to do this and the team suffer (see Wolves and tonight) then we can hardly say, 'oh well, he has been great for the rest of the season so we'll let him off the occasional mishap'!!