Yeah, elbow spikes are always a peeve too.

So in this case, it's all about imagination taking over where realistic design couldn't go.

See "yeah, like wings this size would work on a body that size anyway, I know, I know." Point being, the lack of membrane in this spot is hardly the only problem, but it's just a theme park and I should really just relax. (It just irritates me to see wings drawn this illogical way so often.)