那你就拿這個來說他的AREA TO IMPROVE.

he has room to improve in problem solving skill, espectially when it takes multiple steps and it need ability to connecting dots to get to the next level in his career. 

I think assigning a mentor to him might be helpful.  (這裏看你自己想不想。想的話，自薦一下，你就成他領導了。再把自己手中的活推掉一些。因為你要花時間照顧他。）