He was a well beaten 3rd in his 400 semi at World Juniors, but then inexplicably eased up and came 4th. he ended up with 46.60, and 46.41 (which he would have just got if he'd run all out to the end0 was the last qualifying place for the final.
Did he not know that across the 3 semis it is first 2 then next 2 best times? If you're 3rd, hammer it to the line for a fast time.
More importantly, he seems to have gone downhill from last year. Was he an early peaker, or has he been having injury problems this season? I just looked and he has run 20.80 and 45.6 FAT this year, so maybe he had a niggle or just a bad run.
He was still 15 when he won World Youths in 45.27. A normal progression wold put him to 41 or 42 as an adult. He has certainly not gone forward in the last 12 months.