Is that really his style? I bet he'll stand on the Gedo Mazo, just like Madara does with the Perfect Susano'o. Tobi just doesn't want to get his hands dirty.
Also, shouldn't he kind of be low on chakra? I mean he did control five tailed beasts at once.
I think he will grab Bee at the last second and retreat
First he'll capture Eight Tails, then retreat.
^^This...
And that^^^
Well he did the same with Minato and Konan, and I too think that he is low on chakra, but remember controlling Gedo Mazo might've not drained his chakra, there's a tailed beast inside it (Shukaku) so it drains its chakra instead, only thing that could've drained his chakra is controlling the Jinchuuriki/tailed beasts, but he may still have enough to use some Rinnegan techniques!
he created his plan before kabuto came with edo tensei. he has a plan i'm sure
Really, he have no use for rinnegan techs... xd