On 2020/03/02, I bought player J and K as the reference. They have never been trained. The following is the order sorted by a skill on 2020/03/05.
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player D, 29 y.o., PG
player I, 21 y.o., SG
player J, 18 y.o., SG
player K, 18 y.o., SG
player E, 33 y.o., SF
player F, 41 y.o., SF
player G, 39 y.o., PF
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Today (2020/04/03), the best position of player I changes from SG to PF. The following is the order.
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player D, 29 y.o., PG
player J, 18 y.o., SG
player K, 18 y.o., SG
player E, 33 y.o., SF
player F, 41 y.o., SF
player G, 39 y.o., PF
player I, 21 y.o., PF
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It implies that it is not sorted by sub-level.