One would guess that he's an opportunist who read the room and saw that the environment in the office is a mess (too many different opinions) and the shot-caller is as fickle as it gets. Hardly surprising at this level of management, whether it's corporation stuff or politics.
The way i see it, Ashworth's big mistake was his advice to keep ETH when the underlying metrics were suggesting that United had become significantly worse during his tenure. Berrada was the one who advocated for change and put Amorim's name on the table. Both Ashworth and Wilcox were vehemently against this appointment (for good reasons, as it proved) and, in the end, SJR sided with them. When things weren't going well and the boss decided to sack ETH, Ashworth proposed using external data companies for evaluations regarding the next appointments (while also giving four names that in his opinion would be a safer approach), something that Liverpool did with Slot. SJR apparently told him to feck off with his data and that "the boys" should be able to make these decisions on their own. The same SJR who had put on his smug face in his first interviews to tell us that, under his guidance, United will be modernized by using all available metrics to help us make the right calls and finally enter the 21st century. That was supposedly when Berrada saw his opportunity to become "the man".
It's a freaking circus, if you ask me.