Your son has a good frame. He could be a solid 250 with his same burst.
Those stats are nothing to sneeze at either. He's dominating competition... which is all he csn do.
He moves very well. And he's a player that is used to catching the football.
Also, he may not end up even in the SEC, that doesn't mean he won't be an outstanding college TE. Or PRO.
Like you said. Trust God. Stop demanding from Tennessee's coaches. Let them contact you back. Meanwhile, look around the country and see who uses TEs well.
More than likely he will participate in an All- Star game. And dominate during practice and the game. As long as he stays focused. Don't let negativity take hold. You both have worked to hard for that. Play the long game.
Good luck.