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The Spirit Bomb enables the user to take the 'Natural Energy' or 'Spiritual Energy' From Nature itself...the plants, the air itself, even the wildlife...and create the giant massive ball of energy...essentially the Dragonball-verse's version of the Gargantuan Rasengan.
Now let's take a look at Naruto's Chakra mode.
Remember...Yang Chakra mode Naruto is able to give life to things around him; or...life force energy...
So... Ability to gather Natural Energy + Ability to give Life Energy to plants and things around him = Spirit Bomb in a sense...at least that's the crazy way I see it.
Sage-Yang Kyuubi Mode > Rinnegan Mode > Sharingan Modes
Remember naruto overcame Nagato's Rinnegan at close range? WITH A MADARA'S WILL INFUSED CHAKRA SPEAR IN HIM TOO?
Naruto will beat Obito with some type of spirit bomb...or both him and Madara at the same time or something....using something similar to a spirit bomb is my Crazy theory.
Sage-Kyuubi is coming back!
By that logic isn't Rasengan or Sage Mode Rasenshuriken the Naruto version of the Spirit Bomb?
Anyways...natural energy or synchronizing and blending in with nature to be more powerful is hardly a new concept, and it's just the sort of thing that you can find in many japanese cultural creations way before Goku...
This is a crazy theory. But everyone's ideas are what keep this site interesting.
I'd say the Rasenshuriken is more of a Kamehame ha wave. The Biju ball would be more like Spirit bomb right?
Also Wouldn't you think since Obito has the other tailed beasts and his Rikoudo Senin mode he'll still be stronger then Naruto? Plus his sharingan and Rinnegan. The dude is a total monster