So what you guys are theorizing is that Sakura managed to cheat her way into getting sage mode by storing up chakra and thus simulating a large chakra suplly in order to achieve sage mode.
I fail to comprehend why it would be perceived as deceiving and manipulating her path to acquiring SM. We were never provided with the exact stipulations for attaining other types of SM, there could be variances amongst the three forms' requirements, and considering that a significant portion of the reasoning for the large chakra quantity appears to be related to the preclusion of becoming petrified whilst accumulating natural energy that gathering process is directly associated with the user's chakra control. As we are all aware Naruto had atrocious chakra manipulation capabilities at first and needed to hone his skills with rigourous training. Sakura has no such faults with her chakra control. In fact her ability to properly manipulate and utilize chakra was always held in high regard by everyone, including Jonin and Tsunade herself. If anyone can compensate quantity with quality it would be Sakura.
Then there's also the possibility of power creep which I have alluded to several times in my previous posts with Kakashi's incessant usage of his most chakra consumable techniques in the recent battle.
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That would be cool, if it werent for the fact that sage mode lasts only a few minutes and it could take days for Sakura to store up chakra.
That is only true when the user does not have an assisting creature/summoning to gather chakra for him. In the situations of Jiraiya and Kabuto, they both had the assistance of frogs and a snake to provide them with a continuous flow of sage chakra. Theoretically they could possess infinite amounts of chakra if the creatures never ceased with gathering natural energy for them.
Even though Naruto may not have such benefits he has been depicted as being capable of gathering sage chakra without needing to remain in a meditative state so even his situation is somewhat unique.
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Slug sage mode has never been mentioned in the series, so I doubt it would be now.
Up until chapter 579 there was never any implication that Snake Sage mode existed either yet now we have a user of the ability who had apparently mastered it. That is 92% of the present manga without any previous statements made yet it came to be. But since that same chapter we have been provided with the possibility that there may exist a third animal sage in this Shikkotsu Forest. Furthermore, Hashirama has displayed what appears to be a third variant of SM which is likely the Slug Sage Mode we have been discussing so feverishly.
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And also, I don't think it's enough. With Sasuke having Itachi's eyes, he has the strongest ninjutsu and the strongest genjutsu in the world. Not to mention an impenetrable defense. I think that Sakura needs to have learned something and improved upon it to make it her own, much like Naruto did with the rasenshuriken.
Similar to how Naruto acquired the knowledge of the frogs and implemented that into his own fighting style with SM? Or Kabuto with his development of a fighting style centred around physical/psychological acuity and the reconfiguration of the natural environment around him in his sage techniques? If they can create their own unique variations of techniques or transformed states then Sakura should be capable of that as well.
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Okay so here's my theory. Since Sakura was able to store up chakra. She could have built up 10-20x her normal limit or even more. So she is able to draw in 10-20x more nature energy and balance it out with her stored up energy. What this would allow for is essentially super saiyan sage mode, and it would be one of the most powerful techniques in the series thus far. And the best of all, it would be something only she could have done because of her perfect chakra control.
I don't see how that is much different than Sakura simply using SM. She is still accumulating natural energy and converting it into sage chakra to implement into her fighting.
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So their powers would be unique. In fact, at that point the only weak one would be Naruto since he never actually had power greater than sage mode, he just had Kurama's help.
Slug Sage Mode's area of expertise is probably healing and constant regeneration during battle. If Sakura acquires that she may just become a tank although being capable of avoiding any attacks made sounds much more appealing than what is essentially Tsunade's Yin Seal constantly restoring any injuries sustained to her body.