TMac,
I see your point and am also generally under the impression that things are tighter today than they might have been in 1910. Many new regulations went into effect after the 1929 crash which are largely in place today, although it appears that some that were loosened led to the same kind of stock market speculation excesses that occurred in the 1920's. IT seems as if there are more limitations on serving on multiple boards, etc.
That said, I am certainly no expert on that, and I am not sure if those regulations would cover this kind of small, in house transaction. I don't think HDC or MCC were publicly traded corporations. As a private deal, again, if no one got screwed because of misrepresentations, then there was probably no conflict of interest.