pretty sure the wild trimacs, distinctly had three spots, some barely even have dots, while others may contain additional fragmented dots. They are typically very green to yellowish with a red throat and pectoral area. This fish looks mixed. I've never seen a trimac have any colored pearling whatsoever. Maybe through breeding, but not in the wild.
As far as flowerhorns making it difficult to distinguish between true trimacs vs hybrids, it's not the fact that people did it. It's more of the fact that they did it for $$$ and are irresponsible by not relaying the correct information. Fish are hybridized by man and in the wild, it's called evolution. I have no problem with hybrids, it does suck that there's all this misinformation out there as a result though.