Bukhari put in book form what the muslims were doing so was not bringing about a new version of Islam, it had already been changed. Also, Bukhari does not have the complete details of the namaz ritual, neither the Quran, so what are you saying where they come from? Tell me where Quran says how many times to bow down, what words are to be said, where to put hands etc which are so beloved of the namazi's.
Basic words sujood etc in the Quran do not prove the namaz that is done even if we accept the physical application of the words. Parwez, repeated numerous times before, says do the following of Allah's commands, get the results of these actions, and then you may bow down physically to express yourself towards the Creator. The first thing is lacking in the namaz.
Have you seen any army stop fighting and start praying during a battle? Have you seen any army give up because it is raining? If Parwez means they did, then he was wrong on this and it makes no sense. If he meant that a portion of the army receives instructions, commands, during the battle then he was right. If he meant that when you are in new lands it is not always appropriate to spread your message, those opposed to you may take notice, so under these circumstances [rain= problem times], then relax, step back and re-think what you are doing.
I forgot, Solomon had birds in army ranks, they know their Salat, so they were dong namaz as well! Henpecking.