I am going to approach this from another side, not from someone who trains JJ, but from a teacher's perspective
Do what ever he is interested in. If he is having fun, then do that. If he starts to get bored, get irritated, not dig it, then switch things up. Doing the same thing, day in, day out, for a kid is torture. Kids learn quickly and have few issues remembering things and they are so fast with muscle memory. Sometimes we, as adults, seek perfection in what they do. Perfection will come with time and at their pace, not ours. Give him the knowledge and see what he does with it...it is his journey at the end of the day.
My call would be drill defense, but throw in some offense, some days why drill at all? Just roll and laugh...make it fun. If he is loose and relaxed he'll really learn what he can do. Also, ask him what he wants to do. Maybe he's been checking out some move on youtube and trying to figure it out or he wants to try it...do it.
That's just my 2 cents.
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