Let's get the mutual view of Wilder's fallibility out of the way first. Yes, his final season was chronic in terms of how players who had acquitted themselves so well the season before had now plummeted to become ordinary mortals. I think everyone, including Wilder and Knill, had lost their grip over all aspects of what had made their rise so successful. I've no idea why of course, I suspect that will always remain a mystery, at least for the common or garden variety of Blade.
What does run through your reply is the speculative approach so common to those supporters who think that it's possible to identify the exact reasons for our slump purely by laying out the reasons why in black and white. Speculation has been rife for ages within the ranks of United supporters. It's a case of diminishing returns, if you state something loud enough it must be at the root of why things went wrong, surely? Sadly the answer to that is no. It's completely inadequate to imagine that you grasp the realities of what happened unless you were there blow by blow, day in and day out.
Fiction has a place, just not as part of the re-telling of Wilder's demise and United's fall from grace. I wish I knew, I wish I could pontificate about this, that, or the other, but whatever the reasons for this crash, whatever the chemistry that was at play, what the Prince did or did not do, what timing contributed to the poor if not absent decisions that allowed us to become ordinary at best, but mostly poor by comparison to the heights we had reached, I'd love to know exactly what contributed to our fall. Somewhere between Wilder and the new owner we suffered while their personal psycho-drama played out in public.