I think you are reaching here a bit. He was indifferent when IT was casted. I think his feelings toward Obito was true though, like when Sasuke was about to rush him and go for the kil, I think BZ legitimately wanted that outcome, can't really tell that about Madara. After stabbing Madara's back, he seemed to praise Madara in his recollection story. Black Zetsu has a cluster of feelings, if you ignore his opinion and focus on the other characters, Itachi is more respected.
What does this have to do with my respect? It is about what Kishimoto respects. Kishimoto through Black Zetsu was lauding Itachi. Logic follows the manga bruh. "Tobi was a good boy" though. Dude tbh, I respect Tobi, not Obito when he was groveling for Rin. That sounded pathetic.