whether BB is ok with it or not, what exactly do you expect Bill to do - BB left the jets because they tried to force him to stay. If a coach wants to leave its better to let them go - its not like they will give you their best effort being forced to stay.
all BB can do is try to put together the best staff he can from what is left and from what he feels is worth going to get/is available.
this sucks, but its not unexpected, the entire staff has been in flux for a while now. Coaches know there is no long time coaching jobs left in NE, BB will retire at some point relatively soon and people are looking to get out before the regime changes.