Coming out to retail eight days prior seems hardly relevant when the Sixaxis was announced what, eight months after the Wiimote's motion sensing was announced at TGS '05? Eyetoy doesn't seem really comparable when talking about the Wiimote/Sixaxis though; more along the lines of Natal and Move. Especially since Guardian XIII said motion controller, not motion sensing.
Not that any of that really matters. Who cares who can stake their claim as the first to do something, I'm more interested in who can do it the best.