In theory, I agree - lightening and cold water drownings sometimes do come back. But overall, nearly pointless. Like I said, even if you get them around, it's going to be a PITA to get them out of the back country.
If I was responsible for a bunch of scouts, I might take more. Or more likely, break the kit into modules that I spread around and make part of the troop-level equipment.
Like others say, a class, and make your own. Then carry it around for a bunch of hikes and see what you see.
A volunteer fireman I know who is an EMT and has been one almost as long as IL has had them told me a few years ago he had never personally seen anyone come back with CPR and no one else on his small department had either. AEDs do work well though if you can get it done very quickly. Usually you only have a few minutes where they are going to do much good. But they are just too heavy to cart around.
The reaility is that most people cannot sustain CPR for more than a few minutes anyway. It is just physically too taxing to the rescuer.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob