What Philo wrote was not... representing wide stream Jewish through. There is no such thing.
Not sure what you are saying. The concept predates Philo and his Alexandrian school by centuries, The anthropomorphized "Word" (Memra) for example was widely read in the Targums. Even early rabbinic writings include the concept, at times referring to it/them as Metatron. It would be surprising if not all Jews were at least familiar with it in some form. However, it would be incorrect to say all understood it identically, because as you said, there was 'no and never has been a single mainstream Jewish dogma'. We should expect that Christian origins were not located in the conservative Temple cult form of Judaism but among the disenfranchised or disillusioned, there certainly were many that fit that description long before Philo and his school.
I was not arguing simply for the concept of 'second power' that has been well established. I was describing a specific role as the agency of maintaining creation. It is self-evident from the texts that many Jews had assigned that role to the Logos/Wisdom etc. I don't think I am overstating that.
I understand that in later centuries Rabbinic Judaism renounced the second power theology in a sort of 'Restoration Movement' of their own. Much like the Restoration Movement within 19th century Christianity, it involved more than a little revisionism. But you know that of course.