That's a historians job. Are you one? Do you employ one? No, and neither should you.
History and historical record is not a company or organizions responsibility. It's a publics responsibility. Hence librarys and things.
Where do you think historians get their material? Exclusively from other, disinterested historians who happened to be on site, sans prejudice or ignorance, to take an "objective" photo? One big reason that civilization is so powerful is because it enables people to pursue specialties. But civilization works best to the extent that everyone does their best in all aspects of their lives. Honest representation ups the signal/noise ratio for everyone, including historians.
Yes, this kind of analog Photoshop is, and always has been, commonplace. Memoirs are famously -- almost universally -- distorted versions of reality. People are always tempted to show things as they wish they would be, and they often succumb to that temptation. So Mr. Harden's Looking Aghast is distinctly overblown, but I'm all for holding people, including my near-infallible self, to high standards.
As for what the doctoring of that photo might represent spiritually or psychologically, it looks to me like a clear case of individuation on the part of a talented disciple, someone, in this case, with a deeply religious inclination who somehow got apprenticed to someone deeply paranoid, and scarred by a violent childhood. Not a recipe for long-term compatibility.
I expect it would be difficult to determine when Ueshiba began altering and revising the techniques of Daito Ryu, but at some point it became reasonable to call it a distinct art, yes? It's kind of like the Anglican and Catholic churches; based on the same tenets, but deeply diverged, and essentially irreconcilable.
So, shame on whoever for using this individuation process as an excuse to mess with history, with the wellsprings of the Art, if only because doing so led, so many years later, to this now-tedious discussion. But maybe we can make good use of the incident, as a way to focus on the ways that the two arts differ, and thus get a better idea of their natures, and ours.