I posit this:
We all know there is a distinction between belonging to the church and the remission of sins. After all, whenever we commit a mortal sin that is not heresy we don't fall out of the Church.
Can a catechumen be imperfectly united to the Church without the remission of sins? We all know we cannot separate charity from the remission of sins, this is a condemned error of Michael du Bay. If you have charity infused, you have remission of sins. But what about an imperfect union? This certainly seems to admit of degrees as well. For what of the man made a catechumen but without conviction as opposed to the catechumen with conviction? Are they both imperfectly united in the same way? What would be the difference?