This one thing that has to make you feel a little better about how management is running the show now as compared to in the past. They don't hesitate to jettison poor performers to the MiL and plugin another option.
I agree with your point, but I would word it differently. It's not so much jettisoning people as it is using the resources at hand to make the best use of the 25 spots you have. It's good roster management in way that includes who's doing how well on the farm at the moment and includes the team's immediate needs over the next several games. It's not a case of jettisoning Avery, it's a case of moving him down for Right Now due to the totality of circumstances. Those circumstances include how he's hitting at the moment, but it's not just that and probably not even mainly that.
I bet Buck made sure Avery knows he's not being jettisoned. I bet he also made sure Avery knows what Buck wants him to work on while he's in Norfolk.