I was thinking along those lines too, except that:
1) Kyuubi's Cloak does not Mimic Hashirama's powers, it does however Enhance and Resonate with it....close, but not quite the same thing. It made Yamato's Mokuton so much stronger that it coused vegetation to start sprouting all over the place, even when Yamato wasn't trying.
2) I don't think the Crow has integrated itself with
Naruto yet. In other words, it may not know how to use Naruto's Kyuubi Sage Chakra yet. I think this will happen either by Itachi's intervention, or by some Natural consequence of Naruto using Sage Mode.
**** So far Kishimoto has not let Naruto combine Kyuubi Chakra mode with Sage Mode. I suspect that he is waiting for some big event before he does it. I also do think that successfully integrating both Modes will bring Naruto to his MAximum power, short of him gaining Rikudou POwers.
Bookmarks