I'm hoping someone more knowledgeable than I will come along to answer your questions. In the meantime, I don't want to see your post ignored.
I don't know what concrete evidence there is of AK's or RS' presence at the time of the murder. I asked and was told there was a mountain of evidence. Thus far, not even a pebble has rolled by.
There is rough footage of someone approaching the cottage around 9 p.m. Whether or not the footage is of AK seems to be very much in dispute.
I don't understand MK's various wounds. Let's hope someone will explain the major ones to both of us.
It wasn't AK's and RS' cell phones that were located, but Meredith Kercher's. (She had one phone for local calls and another one for international calls.) They were found discarded in somebody's garden. One source I read said the garden was near Rudy Guede's residence, but posters here have assured me that all the locations in this case are fairly near to one another, so the proximity to RG's house is meaningless.
I hope this helps a little. As I said, I'm pretty new to the case myself.