A very good analysis, I might add. However, there is a uncomfortable detail about compulsion that is always overlooked. When Muhammad was in the cave of Hira, he was COMMANDED to recite/repeat three times. Clearly, he was compelled to follow the demands of Archangel Gabriel. In this regard, there was most certainly compulsion used.
"Forerunners of the Revelation assumed the form of true visions that would strikingly come true all the time. After that, solitude became dear to him and he would go to the cave, Hira, to engage in devotion there for a certain number of nights before returning to his family, and then he would return for provisions for a similar stay. At length, unexpectedly, the Truth (the angel) came to him and said, "Recite." "I cannot recite," he (Muhammad) said.
Muhammad himself described: "Then he took me and squeezed me vehemently and then let me go and repeated the order 'Recite.' 'I cannot recite' said I, and once again he squeezed me and let me 'til I was exhausted. Then he said, 'Recite.' I said, 'I cannot recite.' He squeezed me for a third time and then let me go and said:
In the name of Allah, the Most Beneficent, the Most Merciful .
In the name of thy Lord Who createth Quran
Createth man from a clot.
And thy Lord is the Most Bounteous,
Who teacheth by the pen, Quran
Teacheth man that which he knew not.
Muhammad repeated these verses, trembling with fear. At this stage, he came back to his wife Khadijah, and said, "Cover me, ... cover me." She covered him until he restored security. He apprised Khadijah of the incident of the cave and added that he was horrified. His wife tried to soothe him and reassured him saying, "Allah will never disgrace you. You unite uterine relations; you bear the burden of the weak; you help the poor and the needy; you entertain the guests and endure hardships in the path of truthfulness."
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source - It's wiki, but I am a bit lazy today... its close enough to make my point)
The point is that Muhammad was quite obviously COMPELLED and this throws the whole notion of "No compulsion in religion" to the four winds. In fact, its a bit odd that he would mention it, when it wasn't even true in his own experience. Frankly, I don't know what Muhammad encountered in that cave but it doesn't seem likely that it was any angel.