I think Paul pretty much nailed it. I'd just add a couple of comments -
The rear camera can be the weakest because viewers won't be as critical of a wide shot as of closer shots. But which is the weaker camera - a cheap HD or a GL2? I suspect the cheap HD might be weakest.
Don't downplay that static, wide shot too much - sometimes your best "cameraman" is no cameraman! We shoot weddings with three camcorders and I would never have a cameraman on our wide camera. I depend on that camera to ALWAYS have a good shot. When I go to that camera, I don't want to see panning, tilting, zooming, etc. - I just need a good, steady shot.
Do your best to get all three cameras set with similar exposure, white balance, etc. Remember, different brands/models are likely to need adjustment in post to make the colors look equal.