ok, Psukkar, tell me your thoughts.
I have kinda changed my mind about Rikudou Sennin being the source of Sage mode and am more leaning towards the younger brother. Kishi loves using parallels and it would make more sense if the younger brother was the originator of Sage mode. Rikudou might've discovered natural chakra however it would've been the younger brother who would've perfected Sage mode.
Rikudou = Nagato
Elder = Sasuke
Younger = Naruto
So going with that it would be the younger brother who would have used Sage mode. I think the first toad sennin either ogama sennin or another one, was the younger brother's summon. Nagato himself had a chance to learn Sage mode under Jiraiya had he stayed under his tutelage and if he was a part of the village. But it was Naruto who finally learned and perfected it. So it's possible that Rikudou could've discovered natural energy and taught it to his younger son how to harness it, prolly created the oil waterfall at Myoboku, but it was the younger son who would've perfected Sage mode. This would make alot more sense to me as of now.
Here's an interesting thread if you want.
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