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He can refine chakra.
Or use shadow clones during this technique.
The main question is, whose heart has more chakra. I think probably Tobirama because he is senju.
Or he can use sharingan to read mind to obedient it.
Dudenuse body weights. Or some physical training to build muscle.
The best genins are led by jonin. If someone is average, the team leader can also be chuning.
Are we missing chapter here? Where is a fight?
And he have 6 hearts? So he have 5 allies with himself our time.