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It would seem the sage possibly was able to summon the 2 top sages that exist still.
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What do you think is or could be the story behind them? Could It be that they stayed around because they knew they had to continue to "Protect" until this day (Naruto/Sasuke saving the world) would come? Will Kabuto Summon the Snake Sage? Find out on the next episode of DragonBall Z! (That was a 1990's joke for you kids on this site)
[video=youtube;KyCAZkz4uVg]https://www.youtube.com/watch?v=KyCAZkz4uVg[/video]