Speed. What was faster? Certainly the Mayfly, through which the White Zetsu traversed this cavern, was not as fast as the Kamui for it was not a space-time technique. But was it faster than a kyuubi enhanced Raiton no Yoroi? Probably so; certainly it would not matter for as Bocchiere moved at breakneck speeds through the cavern, so too did the White Zetsu. It was inevitable that each would encounter the other in a relatively short time. As indeed they had.
In what manner was this meeting to be manifest? With great stealth, to be sure. As the invader raced along the corridor, the White Zetsu released spores [Hōshi no Jutsu] into the tunnel through which Bocchiere was barreling. It was a curious thing, these spores, for they contained no chakra of their own and thus could not be detected by standard sensory abilities. With a hive-mind-like-will the vanguard of the White Zetsu, those who had outdistance the others from the cavern where the Gedo Mazo had spat them into existence, bathed the region with their minuscule hitch-hikers in the hopes of at least one attaching itself to the mad dashing Jashinist.
Meanwhile, the slower moving White Zetsu were busy setting up an obstacle through which the man would have to tread. This was why they had fallen behind the others for they had stopped to prepare a welcome for their guest. Taking advantage of their pirated DNA, namely that of Hashirama Senju, these lagging beings began to create a flowering forest in which to greet Bocchiere proper like. It was truly a labor of love, for with great care to detail they coaxed the trees into rapid growth so that in mere seconds the tiniest sprout had risen from the surface of the cavern to become a fully grown tree populated by buds. Perhaps they went a little bit over board, for these trees did not only sprout from the floor of the cavern but from the walls and ceiling too. Truly this soon created a very dense growth of trees whose buds were ripe for flowering. Even now those tight scales were parting, like cracks in a shell, to reveal the brightly colored yellow and orange flowers beneath. Pollen began to fill the air reminding one of a warm spring day [Mokuton: Kajukai Kōrin].