He used their DNA, not the shinobi themselves.They won't . They don't merge other shinobi into themselves, against the core principal of what they practice.
It isn't the same thing...Essentially the same thing as putting Hashirama's DNA on Dazno. Tsunade was able to create a arm and attach it to Naruto, its a perfect arm as it didnt even have Hashirama's face and didnt constantly need to be restrained.
Replacing a certain part of your body with Hashi dna isn't the same as what he did to those children.
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