He shouldnt need a CV at all. Only time they usually need it is when they go 4 inch plus lifts with tight tucks like an Nth degree.
You really want all arms to complete the lift if at all possible.
What happens is you end up making the remaining stock arms the weak link and can run into problems like Rick did at indian graves. He folded his stock uppers while trying to winch up a ledge.
Its either that, or you carry stock uppers for spares just in case. Specially if your dad is going to jambo this one.
If he isnt really going to wheel it, then I wouldnt worry, although the adjustability is still nice to have.
But if that were the case, I'd recomend just a OME kit with a small body lift to keep things simple, and get the better ride.