It was more about him considering the awesomeness of working with Samantha Morton, which is something plenty of actors would love to do.
Which isn’t to say that Andrew Lincoln was sitting there, actively regretting his decision to vacate The Walking Dead to stick around the U.K. and his family on a more regular basis.
At this point, Eric finished her trailed-off sentence by saying, “Rethinking it?”
The point here, however, is that Lincoln can only have incidental regrets here if he didn’t actually work with her at any point, meaning Alpha and Rick won’t get to have any of their comic book moments brought to life.