Why would you want to deliberately mix them? Offspring will not be a new species, or even sub-species. If they are different sub-species/localities and their range does not overlap in the wild (no natural intergrades) then why do it in captivity?
It may be possible, but just because you can, dosent mean you should.
How will you market offspring?
I see nothing wrong with this post. But then again, I'm also one of those "purists" and "naturalists" who are interested in learning about these animals as they are (or as we understand them to be based on current science), and in not perpetuating genetic pollution based on misinformation or ignorance.
These debate has been taken place many times, with those interested in having "pets" being pro-cross and those interested in having a subject of study as being against it (and everything in between). The fact of the matter is that there are currently three recognized subspecies of
jacksonii, and maintaining genetic consistency in captivity is not only beneficial to the hobby, but it is also our responsibility as serious enthusiasts (at least until we acquire more evidence of more or less subspecies).
The alarming rate of invasive species, such as
calyptratus in Florida and
jacksonii in Hawaii is as cool as the irresponsible (notice I made a distinction between irresponsible and responsible) crossing of taxa, and although the consequences of such practices or events may not be as apparent to us while we drive our gas-guzzling automobiles and strut around in our climate controlled concrete jungles, this trend is dangerous and worthy of debate.
Nonetheless, I agree with Jared in that the original author is most likely dealing with the only subspecies on the island,
T. jacksonii xantholophus, unless he's really not in Hawaii and actually purchased different animals at a petstore that so happened to have all three subspecies-- which is highly unlikely.
Other than that, I'm staying out of this one
Cheers,
Fabián