tomato seedlings 'blind'

I have 2 trays of tom seedlings 5 different types. but i noticed today that a few had 2 leaves open, but no growing point and they had thrown out a new side shoot already

Am i ok to let the side shoot grow as the main shoot, or should i start again....the variety is Ailsa Craig. Seems funny that it's only them tho' same seed pkt as last year and they were ok then :blink:

I thought Ailsa Craig was onion seed,so Im no use either!

When you say two leaves do you mean true leaves or cotyledon's  ? I'd be inclined to let them grow either way TBH it's not like they are grafted so they still should be true to type. But like Ice says a pic would be nice .. I'm curious now