I haven't done any sort of exhaustive search for genes that influence earliness, and I also don't know how prevalent these particular genes for earliness are in existing cultivars. 'Early Cherry' is from a breeding program in Oregon that incorporated some wild tomato relatives, so it's possible they caught some genes from the wild that aren't common in cultivated tomatoes.
I don't think I'll have room to do much tomato breeding myself in the immediate future, so I'm just thinking out loud here.
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