Oh I see now. It makes sense indeed. But it seems that officially the plane that appears in Unleashed is not the original Tornado, but another plane that Tails made. At least that's what is on the wiki, I don't see much difference between the original Tornado and this one. I saw that in Rivals 1 Tails says he actually made another Tornado plane, which for me is the Unleashed version (but that was not clearly said anywhere).