My SO and I have the occasional discussion about this cheery subject. She weighs 98#, I weigh 195#. I dive alone most of the time and she is concerned that if I were incapacitated (or worse) that she wouldn't be able to retrieve my bloated butt. We have considered a MOB net, (
http://www.markuslifenet.com/71MLRIB.htm) but I'm not sure she could get me in even with that. (I have suggested that she just loop a line abound my foot and hit the gas... although I'm not sure how well I would plane!)
I'm not remotely concerned about it, but some sure-fire way to haul me in would make her feel better. It might be time for a small hoist!
These pictures show an interesting technique. I am curious as to why you effectively remove the "victim's" ability to help by pulling his legs out first. It seems to me that if his legs were in the water, he could assist by kicking... It also seems to me that you increase the risk of "forcing" his head underwater if you lose grip of his arms while his feet are over the tubes. Most traditional recovery techniques involve "sliding" the victim over the tube. This method appears to require a lot of force to counter the victims presumed tendency to fall backwards/away from the boat...