I'm still a little on the fence about that idea; from the instant that I saw him pass through that gateway in JtO, I was pretty uneasy; if handled properly, the transition from elderly sage/mentor to young, spry hero could have worked, albeit with possible issue of stealing the already crowded spotlight. That being said, G2 wasn't known for handling anything well.
Frankly, I wish that we could gradually stop searching for "deep meaning" or impassioned analysis of G2; the fact is that it's not deep. It isn't. At all. Go right ahead and debate G1; keep tunneling through its mysteries. There are plenty, even after six years. But give poor, kiddy-oriented G2 a rest.
That's not to say that you can't divine meaning of your own from the content, and even new content from your own mind, á la Bionicle Legacy; in fact, I love doing that personally and have no plans to ever stop. We're the caretakers, and as long as we don't sell anything, we're free to do as we like. Bionicle is the Biological Chronicle; it never really dies unless we let it, and though that's been said a billion times, I'll never stop saying it until people listen and own the story themselves.