I'm talking about people who have cases for and against -
People like Andre, and Pete are total no brainers.
IMO, among other active players who should eventually get in there -
Guga - 3 French Opens, committed Davis Cup play, number on in the world, masters series winner 5(?) times over, masters cup winner, and still has some good years ahead of him.
Kafelnikov - one of a few guys to win 25 titles in singles, and 25 in doubles, consistent top ten player over most of a decade, 2 time slam winner, several time doubles slam winner, dedicated Davis Cup player.
Well those are a couple, I'll leave it up to everyone else to argue for or against them, and make a case for other active, or recently retired players