I suppose that hiding staves in water would keep the enemy from finding them and keep the bugs off of them so you could bring them out in the winter when the bugs were dormant..
I know wood sure looks different that has been under water for 30-40 years..
I think if I was raiding another village and had a chance of getting killed, I'd be carrying off an armload of eighteen year old maiden before I'd haul away a stash of heavy, soggy wood. This whole theory seems like a lot of work for NA's when they have a BIG choice of wood everywhere. At least more then we have and most of us have buildings full.