Not going to enter into this, 'debate', but actually the sealing method did not tax them that much. If you read back, Kisame and Itachi both used a clone technique to throw off team kakashi while they did the sealing. Also, it's not that much chakra because it's being split through all of them. Their chakra will come back faster than the statue is taxing them, or the taxation is not very high, if it lasts 3 days.My boy was there for those 3 days and 3 nights pouring his chakra to seal the beasts and that takes quiet a lot of out of even shinobi's with hugh reserves
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