A little update:
We saw what we believe to the Oman Aggressor this weekend. I say believe, as it looked like the Aggressor, but it was named the Musandam Explorer
It was at the North of the Musandam on Ras Musandam Island sheltering in the the bay over night. We saw it depart, but no sign of divers (we happened to be diving in the area and given the weather and tides there was only one site in that area possible at that time.
It is dragging an inflatable Rib as a diver pick up, which would not be my choice in the area especially as it has no shade.
Interestingly according to the Aggressor site and PADI travel its supposed to be operating way farther south in Muscat
Maybe it was on a shakedown of exploratory cruise of the area, I can't believe there are 2 similar steel hull boats operating, which might suggest the name change means it's keeping station in Khasab (or going too soon)
Of it could mean there's going to be a slightly used liveaboard for sale soon..