Read the rules for the show. In some cases, showmanship birds must be entered in exhibition. In other shows they CANNOT be. And in many it doesn't matter.
Without the correct number of toes, he would be DQed in exhibition. In showmanship that would not be an issue at all, although you need to thoroughly know your showmanship bird, including its good points, its faults and its DQs, and if appropriate in speaking with the judge, present that information. What is more important in showmanship is your handling of and knowledge of your bird and chickens in general. A well-trained and conditioned barnyard mix with a knowledgeable handler is better for showmanship than a perfect to standard bird that has no training or repertoire with its unknowledgeable handler.
In exhibition the bird is judged to the SOP. In showmanship, the knowledge and bird handling by the human is judged.
