Did you ever collect yamadori pines before ? i ask that because the first times we collect pines, it is usual/highly possible that the pine die, because we make mistakes, not only during the process of collecting (for example to keep carry on collecting even if it seems that the rootball doesn't look well) but also after : to know how to fix the tree in the container, to know how to let the tree recover in a place without to much Wind, with sunlight but not too much "heavy" sun (depending on your climate), to protect if it rains for days in winter etc etc. So it is better to collect first younger trees to acquire some experience and not collect old tree at first, IMO.
If the tree is very weak, if the tree is very old and you can't have a rootball with soil, if you don't see little rootlets (only big roots that will be cut), it's better to not collect and decide to "prepare" the tree for example if you can come from time to time to feed and water your tree, you can cut (totally or partially) some roots (but leave intact some other roots) and put some compost/sphagnum moss around the cutted roots, to help it make new root tips.. The scott pine is able to make new root tips after a big root is cut (totally or partially) but the soil need to be humid and fertilized to enable new roots to survive/grow etc etc
If the tree doesn't move at all when you try to move the trunk, it is maybe because the major vertical root is going Inside the rock cracks. If the tree moves very easily, it isn't good, it is probably because it has only few long roots so it is (for me) better to not collect it and maybe start to prepare it (cut partially a big root and put sphagnum moss and water every month for example to stimulate new root tips)
The advise i could finally give, to not kill a nice yamadori, like i did with my friend previously and regret, is to stop collecting a tree (to leave it) if it doesn't go well during collecting process (to not carry on collecting if you see that the rootball will be alterred, broken etc)
My2cents but i love scott pines too