Early release huh?
It was implied that Obito simply slipped through until he fell into Madara's hideout
I thought he said he found him in a passage to his hideout, and that could also mean Zetsu was the one who actually found him since Madara himself was very limited mobility wise.
Long time I have been eager to see the next chapter. Shared view was the RG's ability and it looks like Uchiha+Senju comment was directed to Obito's ability to use RG's shared view power without actually activating RG himself.