3 cotyledons ("tricots") can mean a mutation that makes
the whole plant infertile (triploid), or it can be a chance
mutation that only affects the cotyledons themselves, with
the plant reverting to a normal tomato plant as soon as
the true leaves develop.
One thing that you could do with the F-3s is space them
close together, like 12-16 inches, and prune them to a
single main stem. You will not know how the whole plant
produces unpruned, but you can still compare one to another
among that generation as to overall plant vigor, flavor,
production, size and quality of fruit, etc.
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