Does it really matter who operates the sodding thing? Surely what is more important is that we are getting it, not whether it has 'Royal Navy' or 'Royal Air Force' painted on it? The chances are that the crews are going to be a mix of light and dark blue anyway with the ongoing penchant for jointery.
If you want to blame somebody, blame those who decided that the Fleet Air Arm could go back to the Navy in the 1930s but that Coastal Command was going to stay with the RAF.