Ok Yes theres a base assumption that since he asks 'can you', that he might have thought about it ? Is this unreasonable?
And given 'he might've thought about it", Yes, theres an assumption he will market them,
afterall, how many people keep all offspring? If he dosent intend to keep them all, (assuming 'he might've thought about it"), how will he dispose of them?
Regardless he sells or gives away (which is more likely?) "how will you market them?"
means, what will you say they are?
This is a simple enough question to ask of somebody who 'might've thought about' cross breeding.
Actually, im sure he would still have no problem in America selling x bred jacksons, but the point of this line of thought is exactly as Eisentrouti points out.
If he sells jacksons x something and somebody breeds that with jacksons, you still have cross breds, but perhaps unknowingly down the line.
Someone comes along and buys one a few generations in, with intent to breed, what are they getting? It may still look like pure jacksons. Would you pay good money for a particular species without being sure it
is that species? then you breed and offspring appear with the 'x' traits. Your project is ruined.