The only obvious gap is the need to complement the Callaway driver with the X Hot 2 irons, or, better still, the Apex clubs at the top of the range.
Like the recent Nike V Forged set, they could be introduced at around levels 90 and 100, commensurate with their features.
http://www.callawaygolf.com/golf-clubs/irons/irons-2014-apex.html