Yes as far as the clones are concerned Kishi seems to throw out the rules whenever its convient. For example we've seen clones sustain heavy damage yet the technique is not dispelled, we've even seen clones take direct hits from Neji's Jyuuken and even cough up blood but not get dispelled and then there are times when a shuriken to shoulder, a punch or even a simple finger flick would dispel them.
Btw as far as other people being able to use this technique is concerned there still doesn't seem to be any reason why other people can't use this same method to train but to a lesser extent. For example why can't say Tenten use this technique and train with one clone or guy pull a Piccolo and fight with himself because if even naruto has more chakra and stamina than anyone else the sheer number of clones he is using would makes it irrelevant.
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