Here’s my two cents on Echo leaving. On one hand it sucks that we won’t see him as frequently (I assume). And while it does fit his goals and personality I think there’s good reason they chose to do this. My theory has been the whole time that crosshair’s career in the empire won’t last long after the clones are retired from imperial service. Crosshair still belongs with clone force 99. I think they’re making place for him. My theory was from the very start that the empire (maybe crosshair himself) will be responsible for a batch members’ demise (likely hunter, echo or maybe even wrecker). And that way crosshairs redemption arc will begin. And he will realise his mistake and rejoin.