Re: Regenerate a few more fingers?
"If we're going to be picky, didn't Tate effectively become a quasi-Doctor until it started to burn out her brain and she got wiped?"
Well, being picky, she gained some Time Lord power but didn't actually become The Doctor. As did Rose before her. You're probably being mis-led by Donnas comments about gaining the powers where she hysterically referred to herself as Dr Donna.