Due to SM sensing and having manga knowledge, Naruto can always counter the chakra buildup for Amaterasu comfortably via summoning a clone to take the hit, or dropping smoke bombs to block line of sight. Once Tobirama marks him, he too can teleport Naruto out of being prey for Amaterasu due to being a top tier sensor himself.
Both of them have ample knowledge of genjutsu and are not likely to be caught by them, Tobirama due to fighting Uchihas and Madara all his life, and being able to sense the chakra build up, Naruto due to having manga knowledge of all of Itachi's shown genjutsu bar Izanami, which would be useless on the team anyways (it takes way too much to setup and would not work due to both Tobirama and Naruto knowing who they are).
They are also both fast and reflexive enough to evade Susano'o attacks with their own devices, Naruto thanks to the reflexes granted by SM (allowing him to dodge the Third Raikage),
You must be registered for see links
and the ability to
You must be registered for see links
, whereas Tobirama is even faster (being able to set tags on Obito and can mark the battlefield/throw a marked kunai to make distance. By working together they can evade and counter anything that Sasuke and Itachi throw at them.
Unfortunately for the Uchihas, using successive MS techniques, especially for extended periods of time
You must be registered for see links
them
You must be registered for see links
out fairly quickly. Neither Sasuke nor Itachi are going to be able to maintain a Susano'o for the duration of this match, at least not a V3 or above, not when
You must be registered for see links
.
His Susano'o is also not coming out unscathed from a Rasenshuriken powerful enough to damage Kurama, not when Danzo can blow open a hole through it with an inferior wind technique. A Rasenshuriken as large as
You must be registered for see links
would take Sasuke out of the match, Susano'o or no Susano'o.
Close quarters combat is not wise for either Uchiha either. Naruto can oneshot either with the strength he used to throw rhinos into the clouds and frog katas, whereas Tobirama can use any opportunity he gets engaging them in combat to mark them with FTG marks and/or explosive tags, just like he did with Juubito. Afterwards it would be a simple task for Tobirama to teleport a Naruto clone over to their back to mess them up with a Senpou Oodama Rasengan or Rasenshuriken prepared beforehand, and he could do this anytime they are vulnerable.
Thus team one can take this quite comfortably. Thanks to Tobirama's marked kunais, ability to mark the battlefield, sensor abilities and speed, he can reliably teleport Naruto out of danger and/or use a clone to do the same in the event Naruto is unable to do it himself.
You must be registered for see links
and FTG also give Naruto time to prepare and land his more destructive Rasengan/Rasenshuriken variants, which can most likely rip through Susano'o.
Things tip even more in team one's favour if Naruto succeeds in summoning Ma and Pa, and if Tobirama is allowed to use Edo Tensei for GKF.