There's quite the misconception here. Suigetsu' issue was being
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his body to escape a lethal blow. That was thanks to the blade
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for so long. All this gain will do is momentarily split or paralyze Katsuyu. Gain does not last, it will not give off a charge indefinitely like what Suigetsu was introduced to.
And it won't kill a creature that, in significantly smaller forms was able to take on an attack that literally blew away and eroded the earth into a massive crater. Gain =/= Dead Katsuyu. It will cause momentary paralysis in one or more. Gain spam may be a good counter to the splitting of Katsuyu's, though there's nothing to say such a large number of gain can be formed then shot at all these constantly multiplying slugs. before a decent sized one can get off acid.
In which scenario? If Sakura were to punch the ground and cause a fissure; In which rocks of formidable sizes would arise. She can use them as shields to protect any fragment of Katsuyu against the heat.
Not to mention Sakura tanks through both attacks and can attack the hearts as they do this.
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