Tobi's intangibility is instant.That's the strategy, I agree - but Tobi is not using kamui. Kamui is instant, Tobi's technique is not.
I agree about it being Obito's dad, however I don't think he wanted to punish Konoha for Obito's death.. When he said this he still pretended to be Madara.
I think Obito's death affected him, but not only Obito's death but the experience of the whole shinobi world.
Seriously, just take Obito and imagine him ~40 years older - that's how Tobi looks
Omg, Sharingan and its abilities is ****ing inherited. Are you serious? -.-