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I watched this movie more than a year ago, so I`m not sure that I remember everything right.
I`ll rewatch it in a few days and answer your questions.
I can answer the 2nd question right away. That is just some priest from the monastery they were passing by. The tall guy decided to stay with the monks because he had a dream the night they were sleeping at teh monastery (can`t remember if it`s shown what kind of dream exactly).
-edit-
The guy with the envelopes is Franc. War jurnalist who covered all recent wars on Balkan for a German newspaper. He learned Serbian when he was kid while his parents were in Belgrade as German ambassadors. Some people read his reports from Bosnia where he was with Mujahedins who were fighting for Bosniaks and asked him to film the atrocities he was writting about.
That is how he got in to snuff. When wars stopped he decided to stay in Balkans and try to do snuff films different way. He was finding people who would die in front of camera for money. When he heard about Marko and his troop he found them and asked them to make those movies for him. He was finding the victims and selling tapes to rich people abroad.