As a general rule the kids in SCTP are extremely competitive. That is why they are in the program. Peer pressure becomes a strong motivator. A youngster sees a good shooter using a O\U and it becomes obvious to them that they have to emulate the successful to gain proficiency.
Your grandson now likes the sxs so let him start with one and see where his mental game takes him. At 12 he has quite a few years ahead in the program. No need to jump in with both feet. Take it slow and let it evolve.
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