Tobi would never be able to tame Kurama. He doesn't have what it takes. Plus that was Minato without KCM.
Tobirama's destiny is to be inferior to all around him
> get stomped by Kinkaku and Ginkaku
> While Minaato easily fights the ultimate tag team
> admit inferiority to Minato on numerous occasions
> Be inferior to both Oro and Kabuto at ET
> be inferior to Naruto at kagebunshin
> Be used as Madara's plaything
> Be of no concern to Hiruzen while my man Professor is out here sweating bullets trying to stop Minato's ET
> Hiruzen in his diapers is a bigger prodigy than Tobirama