Most of the saplings you dug up, i would not have dug up. The one in the terracotta pot has some pottentional, but i would have directly cut it back to desired height. And leave those 2 shoots just above the bend.
Some of the small onces you can straight out, and plant them as a forrest together. Then you get some more space for more tree's. That solves also the problem that the pots keeping to much moist. Once a week watering might be to much. If you water because you want to firtilize, but it is still wet, you might want to firtilize with something else that you can put on/in your soil. For example i firtilize my pots with potting soil with cow mannure or some other non-liqued firtilizer. For the onces in good substrate, the frequency of watering is increased, then i use liqued firtilizer. In rainy periods i fill theabags for ontop of the substrate.
Ofcouse you can practice wireing and bending also on those seedlings. Just to get the hang of it, before doing it on your best tree, and snap some branches there.