It’s pretty obvious the “resignation” (I think it’s a trick) is designed to keep the seat from falling onto Republican hands, nothing more. Yes, the recall must continue.
But how does it do any good? If Dems are allowed to do this, they can effectively immunize themselves against recalls. Your opponents stare a recall drive? Just wait till they waste their time and money collecting signatures, then swap tyrants! In fact, if the recall process is tied to the name of the legislator rather than to the seat per se, they could just have two resign and switch places. That way even the individual legislators needn't fear those who are supposed to be their masters.