Now that I've reread the chapter, please add one more plot hole to Tobi=Obito.
- Obito "died" in the border of Kusagakure
- It was implied that Obito simply slipped through until he fell into Madara's hideout
- Madara's hideout is revealed to be Mountain's Graveyard
- Mountain's Graveyard is miles north of Otogakure.
Check the map here
to see how far an almost-dead Obito traveled.