Why did Moshe choose specifically the Ketores with which to make the test?
Rashi: 'The nations of the world', he told them, 'have many religions and many priests, who all 1 gather in one house. We have only one G-d, one Aron, one Torah one Mizbe'ach and one Kohen Gadol
What are the implications of "Vehayah ha'Ish asher Yivchar bo He ha'Kadosh!", which otherwise seems obvious?
Rashi: He was warning them that the chosen person was already Kadosh, that he was the one who would come out alive and all the others would die!