The difference between keeping ETH too long and thus making Amorim’s job difficult and perhaps hanging on to Ange too long is that Amorim inherited a squad with serious compositional problems off the pitch. 

A post-Ange manager inherits a squad sprinkled with young players who have potential and plenty of ceiling room to maneuver, although not as much ceiling room as might be expected due to management. 

The post-ETH manager was fucked no matter when ETH got the sack; the post-Ange manager is not *neccessarily* so.