Caudiciforms: Adenium seedlings questions, 4 by plexippus

plexippus wrote:
Last fall I started some Adenium seeds a very generous DG member sent me.They all sprouted and have been growing steadily since. Space and time is limited and I can't keep all of them so I need to thin the herd so to speak. The pictures are of some of the seedlings that I took a few days ago. I am not so much interested in flower color as much as I am interested in shape. Is it too early to start thinking about which ones will be keepers? Should I be doing anything at this point that will help develop their caudex and roots?