Yep, tester == unknown.
You may be familiar with two strains but there's no way to know exactly what the combination will produce.
Negative traits could also be exposed.
Unless I missed something, Gu hasn't really told us much about his process for creating seeds for the retail market.
That's totally understandable, and could even be considered a trade secret, but people tend to make assumptions when information is scarce.
Has he even grown any of the new strains?
I assume not since there aren't any bud pics -- but I could be wrong.
Mrs. Stool says I'm wrong a lot...