Just tried it, and you can indeed unlink the accounts. But you can't login with just a youtube account. You need a Google account. Still useful to relink to a

Just tried it, and you can indeed unlink the accounts. But you can't login with just a youtube account. You need a Google account. Still useful to relink to a throwaway account instead of the main gmail account. But I'm not sure the multiple account will let you stay logged in correctly..