From the Reddit narrative, we can put together an idea of what kind of organization Chayka put together. It looks like a collection of opportunists and shitty people who came in to set up their own little fiefdoms and grab power out of the vacuum left by Chayka's lack of people skills and organizational oversight. If you think about it that way, the Strang "expose" makes a whole lot more sense - these a-holes wanting to salt the earth after Meruelo and Armstrong came in and laid down the law.
I had wondered why Craig Cunningham left with so little fanfare. If even 1/10th of the truth is in that Reddit post, it makes me furious that they would do a guy like that wrong.
As for Steve Sullivan, the fact that his dismissal was announced with a two-sentence blurb speaks major volumes for me, just based off my own PR experience. You don't generally release something that terse without the person in question doing something majorly wrong.
One thing is for certain - the description of Chayka's organization, along with Goldberg, Hofford, and Sullivan, in the Reddit post absolutely paints a much clearer picture of how the draft combine malfeasance could have happened. And, strangely, it makes me more inclined to believe Chayka when he says he had little to do with it, even though as GM he rightfully had to fall on his sword for it.
It also appears that Ahron Cohen was collateral damage in the subsequent purge, which is too bad because I think, of all of the Chayka-era execs, he was the smartest and had the most loyalty to the franchise and the market.