old to new.
wait. notice something about that last tail fin? (form riders of berk) looks like a combination of the last two tail fins doesn’t it? maybe in the next move hiccup can switch from one mode to the other. manual to automatic?
that would explain how he can use that new wing suite of his.
and hiccup is not stupid. After all they have been through he would never want them to get separated again so this would make sense. What if something happens and Hiccup is nowhere near toothless?
(knowing him something will always happen when toothless is not around :L)