Forget the sales numbers...I'm trying to figure out what the advantage is of having 2000 people working on GH versus a couple of hundred people working on RB?

Actually, the Sierra brand should have died when Vivendi first killed it. Having also been at Vivendi until just recently...the "new" branding of Sierra never made sense since Vivendi went to great lengths to dissolve the brand a couple of years prior. Essentially, the Sierra brand died when Vivendi bought it and recycling it to try to create a stronger brand identity was borne out of a lack of creativity as opposed to a desire to bring the Sierra label back to glory.