Cap is the "oldest" design? I guess you could hang your hat on that. Cap was designed in 2004, tested throughout 2005 and released in 2006. The Infusion was designed in 2005 and went straight to production in 2006. The Wildcat rumors started in 2007 and was announced in 2008 - not quite straight to production, but only had a few months of testing before the first boat was sold. Really, there's only a matter of months between them and all three incorporated very very similar design elements.
In any event, I think it's remarkable that we can have this sort of debate and still all show up at an event and race heads-up... where we frequently revisit the debate as soon as we get off the water. Pick your poison.