Paw paw I though was dead resurrected..

I have started some pawpaw from seed that I got from KSU. I followed directions on giving them a cool/cold time in the refrigerator and planted them. They have been growing but two of them looked like they died- lost their leaves and looked like a twig in the ground. They are in the tall kind of starter pot to allow for a taproot. I just kept them , one has really just shrunken and died, the other recently made a few leaves and suddenly I see has a buddy growing next to it. I don’t think I put two seeds in one pot, would it already be making a shoot? I’ve put some vermicompost in there and hoping for the best. They are definitely light sensitive, the ones I have lost were getting too much direct sun... how long should I keep them in pots before transplanting ? Is there a certain time period they would have a growth spurt? Mine are like a year and a half.