the only one scene where we saw Sipke as adult was my fav scene. of course including the incontrollable overpowered Twilight. i have no idea for a better title. making it simple is already a good idea.
So Spike isn't the same as wild dragons then? His adult form looks far larger and frankly more powerful, if a bit dopey. Then again, Discord looks silly as all hell and he's reality-alteringly powerful
It does make sense; why would they give a rookie unicorn a dangerous wild dragon? Spike's kind are probably some kind of more demure and intelligent variation. Like a chinese dragon as opposed to a european one.