For me to respond to every point would be too long.
Izuna gave up his eyes to Madara because Madara was going blind. They never "punished" each other.
You say that like Obito's only power is Kamui. He can control the Gedo Mazou with only sharingan and senju cells, and has mokuton.
He has shown to be a more advanced fire user, and taijutsu user
his genjutsu was strong enough to kill Konon and control Yagura(a jinchuriki)
Yah but he has the crow
Day of the fight
Obito: Ok then I will fight you
Itachi: *turns to Crows*
Obito: Why do you like crows so much
Itachi: When people see them the know that an ill omen has been set on them
Obito: Wait does that one have a sharingan?! *sees sharingan*
Itachi: Yup, but now you you work for me
Obito: Yup
Before you respond. remember
Shuishi = god of genjutsu < S6P
Obito has no knowledge of the crow, knowing itachi uses this crow jutsu, a strange outlier crow that is not part of the main pack and has a sharingan would undoubtedly catch his eye.
Obito is not special besides his training and cells.