Naruto - Chapter #516
This chapter is notable not just for the cute art couple's bickering, but also because of Sasori hilariously insulting Obito right to his face, seeing him only as Tobi, who he has no idea is in fact much more powerful than he ever knew.
It says a lot about Obito's (lack of) ego, in stark contrast to Madara (who would've immediately and uproariously disabused Sasori of his misconception), that he didn't even attempt to correct Sasori or anything like that.
(Of course, Madara would've never created Tobi in the first place...)
Especially when Sasori's words strongly imply that he believes Kabuto is the head honcho here, and that snakey man is the one ordering Tobi & Zetsu around, lmao.
I guess (t)obidei shippers can probably headcanon that Deidara knew (somehow), and is having a laugh, because he's just mocking and almost chastising Sasori in response. ("You're mighty brash for a dead man, my man!")
Seriously, just look at Obito — he's just staring at the camera like he's in The Office lmao.