I don't know if I totally agree with you on that, East TN and West TN each have great players, the A and AA state champs this year both came from West TN, and East TN was well represented at the Spring Fling. But to answer your question, the best players I've seen in Middle TN coming back next year are:
Bobby Bratton, SS/P, Columbia Central, he is a tremendous defensive shortstop, a great hitter, and also a good pitcher with good velocity.
David Price, LHP, Blackman High School, well let's just say he is a beast, upper 80s on the gun, sometimes hitting 90+.
Jeffrey Lykins, SS/P, Marshall County, a good shortstop, a good hitter, and a great pitcher with awesome breaking stuff and pretty good velocity on the fastball, I've heard 90, but I don't believe it, I'd say 85-86, but still a tremendous pitcher.
Ahmir Watkins, OF, Blackman High School, tremendous speed, covers a lot of ground in the OF, makes things happen at the plate and on the bases.
Plenty more players, not taking anything away from players I didn't mention, and definitely not taking things away from East and West, the question was just about Middle.