Well, we will see from the experiment whether the GG's are growing or not....even in winter. I'm not smart enough to know.
But I can certainly give you a reason for stocking Gambusia over fatheads (or rather in addition to)...for small predators. The Gambusia will be there forever, the fatheads disappear in a short time. I have ponds with established Gambusia populations that are over 75 years old. I have not a single pond that has a fathead population that has survived any length of time. Gambusia are small, yes, and light, yes, but thousands of small things add up to bigger things. How's that for tech talk?
As far as naming goes, names mean absolutely nothing to me. It is the product content that I buy and it is performance that I measure.
p.s. over-a-ton-bass that's kind of catchy, so to speak.