If it means anything...if I knew the quality of fish that american breeders can give, I would've looked at them as equally as much (if not more) than the Thai sellers on AB. But, yes, if you want to breed PK, then I would get him and a sibling. Just don't rush yourself. You'll know when you really can't stop yourself from starting/continuing a line. I would get an idea of a fish that you want, without pictures, and then look on AB for parents to lead towards that fish. This may mean using siblings, or finding a random pair.
If we are made of cells, then a scientist who studies cells is actually a group of cells studying themcells!