Boudreaux
You are being silly.
The 53 (which I think is fantastic and we should have bought incidentally) has many variants. One of these is the K. It is last in a long line of development of the 53 series. It is thus a derivative.
To suggest that the V22 is a derivative of the XV-3 is imbecilic.
A descendent, yes, in much the same way that a 53 is the descendent of that first sikorsky helicopter he flew wearing the hat.
Have all the arguments you want about which is better, bigger, faster, more cost effective etc, but don't be fatuous.