Join 2 open subd objects

I am trying to figure the best way to join these open subd’s
when I use Loft I still have naked edges, still open.
i can’t get Bridge to work. is there something that might work? or do I need to start over?
16 test-2.3dm (454.7 KB)

bridge needs matching edge counts, you have 14 on one and 16 on the other. make them match and bridge. Or you can stitch them point by point and triangle off one or your face loops.

see this fabulous chart created by Pedro Amaro Santos for helpful info on how to manage these transitions.