Is it good to get the Medicare Advantage as the secondary medical insurance?

My friends sister was convinced by the owner of the business to go A&B and get off the company plan in order to save the company money while she continued to work for 5 more years. She then retired and asked me to write a Supp without underwriting as she had pre-existing conditions. I wouldn't do it since she did not have Loss of Group.
Another agent clean-sheet her application.

Oh, you’re saying if someone takes A and B and does not keep their employer plan at 65? Well of course they’re not GI.