The problem is, when you choose a subject in his 50's, there's really no way of demonstrating "maintenance" through a series of photographs. Lots of people (my father being one) get to a certain point where they're pretty bald, but it just sort of stabilizes itself without intervention. Apparently these individuals are not genetically pre-destined to be slick bald NW7s, though they would certainly be considered bald by most observers. I'm not even saying the lotion didn't help stabilize the patient's hairloss to some degree, there's just absolutely no way of knowing one way or the other, which is why people bemoaned Brotzu picking an older person to begin with to use in the slides. The regrowth itself is aesthetically negligible, which also ties into the last point, but can also exist independent of stabilization.
In other words, the photos of the male study subject that Brotzu hand picked show virtually nothing at all. If he truly wanted to prove his lotion was even fractionally as effective as advertised from his interviews, he should have picked a younger patient whose follicles are still being ravaged by MBP and conducted the trials for longer.