From the beginning of the battle of Naruto and colleagues with Tobi till the recent chapter 610, I wonder how many times Hachibi's tentacles were cut-off. But we still see its tails grown maybe its growth rate is fast enough to get cut again after few attacks.
Then why Kishi cuts off Hachibi's tails every now and then? Just because it has the ability to grow again?
What do you guys think?