After watching Douglass play it would be really hard to call him a good coach. They play with absolutely zero discipline and run no offense at all. You could argue that their kids can be difficult to coach but I saw Tommie Griffin's John Marshall teams play and they were extremely well coached and disciplined.
Just from my era of watching OKC bball I would go with (I consider the suburbs as Metro):
96' John Marshall (Adkins, Heard, Hall, Tate, Cooper) Undefeated State Champs, major D-1 talent
'02 or '03 PCO (Smith family, Hayden, Burtschi)
'02 MWC (Williams & Alexander)
'99 McGuinness (Crawford, Amous, Bluitt, Merritt)
I think those teams would have beaten Douglass pretty soundly. Douglass has a lot of talent but they are soft inside. The Twins are athletic but get pushed around and Hill is extremely soft. Guys like Sheldon Williams, Marques Hayden, or Terrance Crawford would abuse those kids under the rim.