if he bred the sharp strain albino to a kahl strain albino, all of the babies would have been 100% double het for both strains. Think of what kind of mess this could create with the albino world. There really isn't a way to distinguish between the 2 strains. Sure we can take an educated guess because the sharps tend to have more color than the kahls, but how do we know for sure that what we think is a sharp isnt actually a really pretty kahl strain albino?
Basically I think what that would lead to is mass confusion in the boa world. People would be selling sharps as kahls, kahls as sharps, there would be no telling which strand you actually bought until you bred it, and heaven forbid it's not the one you wanted, you wasted a breeding season on an albino that wasn't what it was sold to you as.
However, I would like to see the results of a dbl het x dbl het for both strains. The litter would obviously consist of a lot of hets, but there would be a 1 in 16 chance of having a sharp/kahl albino....... I wonder what that would have looked like....