Trust is a huge factor. About 10 years ago I started looking for pure Floridas. Among others, I contacted Bill Wingo, a local and highly reputable Pro and was told that he was having trouble finding them. He was finding, through sampling, about a 5 to 10% mix. I appreciated his honesty.
I had not realized that most Florida bass carry some intergrade genes.
This thread has reinforced something I said years ago regarding experts. All of us here, regardless of education and/or experience, have a similar outlook. We are simply students sharing our experiences. Thanks to all, especially Dr. Neal, for reminding us of that.