I think that the implication has generally been that the "uchi-deshi" were training with Ueshiba full time daily for whatever period they were there as uchi-deshi.
I agree, but implied by whom? As I see it it's implied by those who believed such and thus think all others saw it the same way. I call that assumption myself.
Those who were 'shocked' by the realities 'uncovered' by historians or whoever were to me the most deluded. I have yet to see anything shocking and yet find plenty I wasn't aware of but it's no big deal.
Thus I find all those who were so shocked now behave like they're the owners of some special secret.
From one extreme. deluded, to another, experts in the hidden truth. Amusing.