While we are not on the level of these teams I think of the recent year Grizzlies (even back to the Gay and Mayo days) and the Pistons from 2004-2010. Teams that had above average to all star talent at every position yet had no "go-to" guy. No one on those teams averaged above 20ppg, at least consistently. You could say Billups or Gasol for those teams but would anyone really be that shocked if Rip/Rasheed or ZBo/Conley took the last shot instead?
Guys like SMart, Young, Thorton, and even Bradley don't seem shy throwing it up so with that many guys on one team its hard to have one guy be the focus every night.