If I recall, McChrystal was fired by Obama - not for a major policy difference - but because McChrystal talked out of school about Biden.
Now McChrystal - or more accurately, McChrystal's wife - wants the former general rehabilitated and reingratiated into Washington circles. That's where the money and power is.
So now you see these stories. McChrystal doesn't like Robert E. Lee. McChrystal doesn't like repeating rifles. McChrystal doesn't like President Trump.
I think his wife is directing him in what to say.
McChrystal liked cleaning Zero's feces off Reggie "Shove" Love's manparts. Two thumbs-up from Stannie's wifey!