Dillon
The 139 is of similar weight approx 14100lbs as the Wessex 13600Ibs. The Seaking when I flew it had a max weight of 21400lbs.
The problem with hovering higher in calm wind in a Seaking or S61 is that if an engine stops you become, if you're lucky, a boat. The 139 will (allegedly) remain in the hover as would old Walter the Wessex
The area that the 139 is operating is so busy it will have no problem finding a ship to cross winch to so it won't need its own lifeboat
HF