Looks like it would need to be removed from the other person's account in order to show up in yours, but AFAIK there's no way to remove it.
But you don't need to have it in your account to fly with it either.
Source: Mine was upgraded/configured by a friend and thus is in his account, but I've been flying it for one month since with mine. Doesn't show up, but that doesn't seem like a problem.
Would still be good to have an official word about how it's supposed to work.
Thanks for the reply. Seems strange you cannot have it on your account if you are signed into your account with it. As long as it flys o.k then I surpose that's all that matter. I'm sure this will be addressed in the future.