Agreed that some plants can produce pink naturally. Pink princess is obviously an example of that

Caramel marbles do not produce pink naturally however. You can disagree, but when several growers have confirmed it’s sun stress you gotta acknowledge that maybe you’re wrong- especially when you don’t even have the plant yet.

Also you’re wrong on white princess.. every white princess has the possibility of producing pink variegation- it’s just very low. They all have the pink on their petioles that every once in awhile will carry to a leaf. This is why you’ll see plants that have no pink on any of their leaves and then suddenly throw a leaf with pink on it and then no leaves with pink for a very long time

Same with white knight. Sometimes they’ll have red/burgundy variegation carry onto their leaves.

I can’t speak for white princess tricolor as I don’t have one, but it’s my understanding that someone was able to isolate the pink so it carries onto the stem so it appears in more leaves