As we can see, here Hashirama had a very intrigued face.
It was when Sasuke's flames were dominating the Juubi. It's true, Juubi got rid of the flames, but only after those panels!
So, I really think that Hashirama is astonished by Sasuke's performance and unique skills, and sees in him the best candidate for Hokage. Sasuke is strong and has a mature personality, he is able to see that using the beasts as weapons was not fair, and wants to help the alliance to put an end to this. Also his flames being able to suppress the beast means that Sasuke is around SO6P tire.
Naruto is also messed up in the panels. He feels his rival getting stronger and stronger and realizes that becoming Hokage won't be that easy.
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It was when Sasuke's flames were dominating the Juubi. It's true, Juubi got rid of the flames, but only after those panels!
So, I really think that Hashirama is astonished by Sasuke's performance and unique skills, and sees in him the best candidate for Hokage. Sasuke is strong and has a mature personality, he is able to see that using the beasts as weapons was not fair, and wants to help the alliance to put an end to this. Also his flames being able to suppress the beast means that Sasuke is around SO6P tire.
Naruto is also messed up in the panels. He feels his rival getting stronger and stronger and realizes that becoming Hokage won't be that easy.