My condolences to his family and friends.
My initial reaction ( having lived on WS and MN for 7 years ) is that the lakes are not a good place to kitesurf without support after temps go below 45 deg in Nov
water temps here in tampa will never go below 65 degs except momentarily during cold front passages in shallow water and never in deeper water ( the air tho' can get below 50 easy )
still, hypothermia can happen below 70 deg if not protected
I agree, colder temps should always be kiting in groups , not alone
BUT, NOBODY EVER WANTS TO GO OUT WHEN IT IS FREEZING
So I guess I have to do solo dawn patrols next few months