Since you didn't provide a link or tell me what page you're talking about, I'll assume you are talking about the type page.
The reason there are several Lt. Surge sprites is because they are separate by Generation, and he appears in each of the first 4 Generations. Whereas Elesa is only Gen 5 so it's shown as one.
The idea of that section is to list the gym leaders, not show all their sprites.
