If I had to guess what’s going on, I’d still be leaning toward nerve damage here.
I have, and still do experience “groin pain”, and it’s not because I was injured in the groin. Its nerve damage, nerve hypersensitivity, etc, etc.
A damaged nerve doesn’t have to hurt at the site where it is/was damaged. Like a chain reaction, nerve damage, and nerve hypersensitivity will travel and make other areas hurt.
Pain, which is all created by nerves can do this anywhere in the body. This isn’t to be confused with what many commonly refer to as “nerve pain”. All pain is nerve pain.
Damaged nerves, and angry nerves can take all kinds of different pathways such as, ilionigual nerve pathway, genitofemoral nerve pathway, pudendal nerve pathway, other pathways, etc, etc.
I’d be a bit surprised if he doesn’t have some pain at the end of his vas, or somewhere within the anatomy of his bad/worse testicle. Perhaps he doesn’t, idk.
I actually get pain/s in many areas, and sometimes I don’t have a lot of pain, or any pain directly somewhere within the anatomy of my bad side (known hot spots). From groin pain, hamstring pain, buttox pain, cord pain, etc, etc. I do experience this myself.