Wet/dry doesn't matter
To adress the wet drowning/dry drowning thing. Some people will get water in their lungs others won't. It has lots to do with their own physiology. The first aid is the same for both, as once water is in the lungs we are not getting it out the way it came in. So we breathe for them and check for a pulse. For a period after someone stops breathing their pulse will continue so getting to them quickly is important. If you are not sure if there is a pulse or not, pump on their chest it won't hurt.
Defibrillators can work wonders with near drownings as when the heart becomes affected it can go into a shockable rhythm. Lightning could also do this. I'm not putting one in my kayak though.
Here's an important point. Anyone who goes unconscious as a result of a swim needs to go to the hospital. Even if they are resuscitated. If they got water in their lungs it will be absorbed into the body. It damaged the lung tissue though and can cause more fluid buildup later (edema). This is also called a "parking lot drowning." Monitor their respirations on the way out, if they sound clear and are breathing easy then fluid has not yet started to build up.