Dwight Freeney.
Thank you for being honest in your opinion and assessment, a hard task for parents, we never want to hold back our kids. One thing for sure is that Shy will have a greater understanding of the game than the average player because he knows what is required to play other spots and what they see and think. Long term this can play well for a coaching gig.
I want to see Shy on the field more and believe he will. As you say, open field tackles on ST are generally tougher, if he could develop a quick first move off the DLine, he would be devastating to opponents, disrupting the running and passing games, TFLs and sacks, a la Mr. D. Freeney.