I found Naruto potential to SM to be very interesting.
1 - Naruto was learning to increase his SM time limit. When he fought Pain he was limited to 5 minutes or 2 FRS. During the war Naruto could use 3 FRS before he ran out of SM chakra. That would mean his time limit should have increased to about 7 1/2 minute. Right before Madara gained his real body was created the biggest SM FRS and he didn't run out of SM chakra -
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- That FRS had to be equal to at least 10 FRS. Yes, I know it's possible the shadow clone were using their chakra too, but that still a big jutsu. Base off that Naruto time limit should have increased to at least 20 minutes.
2 - Before Naruto fought Pain he was learning to gather natural energy and active SM while moving -
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- If Naruto ever perfected that he wouldn't need toads or have to worry about SM risk. I would have loved to seen that.