I would follow this general pattern of relative intesity on a weekly basis
Mon medium (This would be a session off pace work ie 2x3K @ 5K or 3×600 @ mile pace etc.. or a 3-5 mile run)
Tue hard (event specific work for upcoming meet)
wed med hard (This would be a session based on pace work that was preceeded by MaxV work, which I would probably preceed by hurdle mobility)
Thu med or low (Pool/Bike/easy 2-3 miler)
Fri off/active rest or race (hard)
Sat race (hard) or low
Sun off/active rest
I would probably do medball circuits, MaxV, and Plyos 1 time a week.
When I speak of moving back, I would tend to think his "speed" would be better served in 800/1600 realm, but only after a couple of training years under his belt before I thought of making him a true threat in both of those. I can find ways his "speed" and lack of training years would serve him better success without burnout having him master in HS what mid distance events typically are considered 400/800/IH an occasional 1600 and 200 thrown in there.