Would be stupid if The bud of flower couldn't sprout again by absorbing more nature energy(ie regenerating itself), because the God Tree is godly deity.... Kamui would be too much haxxed and Kishi would be idiot to allow that.
However If The bud of flower could sprout again by absorbing more nature energy(ie regenerating itself), then I approve this idea as very good. Why ? Because it would buy some more time for Shinobi Alliance while delaying Moon's eye plan also giving Kakashi epic entrance and big impact on plot.
For example finally 15 minutes are about to pass. The Flower is almost fully bloomsing and Shinobi Alliance begin to give up in despair as Obito trumps. Suddenly in last moment Kakashi comes out from other dimenssion Kamui the bud of flower then Obito become angry at Kakashi because, now Obito has to wait again 15 minutes or little more(sprouting bud after absorbing nature energy) to realize his Moon eye plan.
In short, If this is first scenario then I would hate it, but if this second scenario then I am all behind this theory
