Hi SB, indeed a beautiful flowering. The correct name is 'Big Triple G', not 'C'.
The flower is 30% digbyana and 30% dowiana, so green and yellow is dominant. The red around the lip is from other species like tenebrosa/dowiana and will vary in intensity epigenetically. This means it will vary based on environmental factors (from no red to as much red picotee as yours, and everything in between).
When I use sea kelp supplementation, I see many of my flameas be more intense in their flaring markings. Also with increased light, cooler night temperatures and humidity will make more intense greens.
The line from Ports of Paradise is not very fertile and few hybrids past F1 from here. Possible reason is complexity of the whites used to create it, whose genes when mixed with yellow/green species become too mutated to create seed. In fact, from this plant, only 7 progeny F1 exists. Too bad as it was hoped it could produce massive greens from this line.
It's true there isn't a Cattleya forum that could match this ST. I have been on Orchid Board and Orchid Source forums, and only a few handful of knowledgeable people are patrons. But there are many expert growers out there who don't connect or voice opinions. All we can do is just keep posting and maybe attract them here.
In fact I find quite a few great Cattleya growers here (on ST) who appreciate beauty and have much knowledge to share.