It could well be lazy drawing but
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we see Obito has Sharingan, then 17 and 18 and the first picture of 19, we don't see Sharingan, until He is enveloped by the mask android zetsu type thing . . . almost as if the maztt (haha) takes control of Obito . . .
He was curious what it felt like to poo so maybe he wanted to feel something (granted with only half a body but still haha)
The entire last page is creepy.
"..." common place for "wtf is going on"
Then worried questions, as in, this isn't right, coupled with the look on his face, worried/scared/helpless.
Followed by persuasion by the "androids" (he's a nice guy/dont you want to save rin and kakashi?)
Then "Thank you!!"
So I thought Obito was saying thank you. But perhaps it's maztt - as in, thank you for the body of a young uchiha who can sub consciously use MS already (Madara: its almost as if you slipped through it [i.e Tobi/Obi MS]) and control hash cells . . .
Madara isn't present, so this could well be as others predicted, another step in the Zetsu plan. The man/android we know least about. If we know anything from Kishi it's that the more shinobi know about other shinobi, the less dangerous they are... and the less known, the more dangerous . . .
Could Madara and Obito be pawns in the Zetsu plan?
EDIT: Also, I can see Tobi "breaking down" then "breaking through" and helping the village in the end. Probably via Naruto shouting about will of fire and help my friends etc etc etc, you know how he does.
PS. people whining about the flashback chapters, remember, they're chapters, they go with a whole book. If it were a book entirely built of flashbacks, then yeah, be pissed, but it's single chapters that are making a whole book.
TL;DR - Don't reply then XD