In the scan below, you will see that Tobirama really wants to save Sasuke. Possibly even sacrifice his own soul to save Sasuke's life.
Tobirama (being a sensor type) should have sensed Naruto "dying", but it seems like Tobirama is more concerned about Sasuke.
I think the reason for this is because Sasuke is more important to this world, and Tobirama sees that potential inside Sasuke, not Naruto.
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Tobirama (being a sensor type) should have sensed Naruto "dying", but it seems like Tobirama is more concerned about Sasuke.
I think the reason for this is because Sasuke is more important to this world, and Tobirama sees that potential inside Sasuke, not Naruto.