I am frankly bemused,
yeah thats the right word, by the resignation of so many here to Michael Rosenbaum not returning. It assumes that it would announced far in advance. It probably won't be publicly known until the final few episodes are shot.
For all we know he has already agreed to return. I are not saying for sure he will. Just that they have not given any kind of outline of the remainder of the season yet or the final episodes.