You wrote the Messenger had none Quran revelation, conversations with Jibreel, and that is where he got some things from so why are you saying you are not quoting from 'other' sources?
You also wrote the people knew what salat was so they knew how to pray as you do, which is none Quran but ancestor following.
There is no 'ablution' verse or 'abstinence' verse equivalent for salat, detailing what you do. Hence the need to make the Quran 'clear' for namaz prayer by looking at numerous verses for the most impotent act performed 5 times a day by people.
Salat is not an allegorical concept. The Quran says it has allegorical and literal verses, so the literal verses should and are CLEAR to understand, so yes, I want a clear verse telling me what to do if it wants us to do namaz.
Have you got a list of all the verses you need to perform the namaz? Do they give the complete picture? Does this make sense as they do not?
Food for thought, or abstaining from thinking!