You obviously missed the news where a lot of the neversoft team has been sacked and the rest of the team are getting the same treatment after GH6 is completed in April.
But they've got a lot of talented people on their team despite if you like or dislike guitar hero. I've always felt that GH was charted like it was to make it feel different from RB. Otherwise we'd just have two RB games on the market
I'm sure if or when they do decide to chart stuff for RBN(kind of like Wavegroup), they could adapt to the RB style quite easily.