Judging by the other dragon's territorial reaction in Owl's Well, I'd say it's a good thing they left him at home. In fact, I'm betting Twilight had read enough about dragons to make that call.



As for growth and wings, in my head dragon wing growth and maintenance is part of the "natural growth"/"no greed" path. The dragon in the Everfree in Owl's Well had holes in his wings; in my head that's because of the greed. The one on the mountain in Dragonshy wasn't too greedy to move yet, so his wings hadn't decayed.



(Either that, or Spike will get his wings during his first draconic nap.)