You don't have to be a Knuble or Avery standing in front of the goaltender waiting to create a deflection to provide presence/traffic around the net, force/funnel play that direction and GO to the high scoring areas looking for rebounds. ANY player can do that.
Trotz:
Screens and rebounds both. The Caps have been a team where everyone, even the "grinders" try to play a cycle game for a bit and then maybe get some kind of drive-by shot off. Few guys want to go to the net and crash hard, or fight for rebounds. The forwards don't all have to park it there, but they should almost always end up there.
And it seems to me Trotz's system will not work without that kind of funneling of effort and presence toward the net. Ovechkin, Backstrom, Mojo, Kuz, Bura...all those guys are perfectly capable of getting close and hawking rebounds or passes. But instead everyone wants a one-timer or a clear lane to skate to the high slot. Those aren't bad, but your offense is one-dimensional and the goalie can front you pretty easily if that's all you do.