obito wanted Sasuke to sync to Gedo mazo after Nagato died.....
he was talking about sasuke and not madara
i'm fully aware of who obito was referring to. But plans changed, did they not? sasuke was indeed supposed to be the pawn alongside obito on the mazo, but things got thrown off-track due to kabuto's "battle power."
...and now, madara is that pawn alongside obito on the mazo. kabuto had obito on his heels but he managed to flip the script.