PianoAl, the bib system is different from the typical top and bottom separates that you have. The bib outfits, as long as you have both top and bottom, can be rolled to be quite dry.
But the typical dry top and dry bottom separates like you have will never be really dry in a swim. You can layer them well, cinch up all the things that can be cinched or pulled in, and they will still leak in a swim.
The only time these typical “dry” separates is likely to be dry in a capsize is if you can roll. In that case, with a neo skirt, you are not in the water long enough for the seep to get going.
This is the value of Kokatat’s Icon dry suit You can wear them as separates when getting wet would be OK, or wear the top and bottom together and zipped to be dry. It also happened to resolve the issue of relief for may women who never cottoned to the drop seat (like me) and provided equitable choices for men as well. This is a good thing.