Naruto Chapter 604

[Tofu #2]

So the moment were Obito sees the image in his eye of Rin being killed etc... Is that the awaking of the mangekyo sharingan? Or the unlocking of it? To it can be awakened later? Or is it something else? Still very confusing.

That is obito looking through kakashi's (obito's) eye

Either this or when Madara open his eyes place Obito in his Genjitsu.

I don't really understand this thinking because even if it were true, Rin obviously died at some point anyways, and how would Madara know what Rin&Kakashi look like

2 things that are kind of interesting but might be just a drawing error, Kakashi isn't wearing his forehead protector and in the very last panel both of their pupils are super dilated