This question/inquiry is mostly targeted at Jonas but if others have useful information to contribute, please share.
I’ve read most of the Bonsai Tonight articles about growing JBP from seed and about some of the stuff Jonas does with young seedlings. I’ve also read other resources including Bonsai Today #12, which has an article on developing JBP from seed. In that article they suggest pruning the apex on the 2 year old seedlings if they are strong. Their method also seems to rely on repeated pruning of the apex. Based on the what I can recall it seems like Jonas’ approach differs. He seems to be wiring the seedlings earlier to add shape and I don’t recall seeing much about early apex pruning (for instance here: https://bonsaitonight.com/2014/07/18/developing-black-pine-setting-the-first-curves/). Visually it looks like the plants in Bonsai Today #12 are more squat and have a lot of lower branches (some as sacrifices I presume). Now maybe this is because he is trying to achieve a different end result (in terms of style or size) but I was hoping you (he and everyone) could fill me in on how pruning the apex and sacrifice branches fit into your JBP development plan? If I missed an article of his that answers my question please do point me that way.