For the record... I would also prefer the upside to Kaep but for a 1 yr fix/clone of RT I go with Cutler.
As long as Cutler is motivated to rejuvenate his career he will put up similar if not better numbers to RT (why wouldn't he seeing his stats are basically the same for career with inferior talent.)
I trust Gase's analysis and feel that the decision is also a vote of confidence to RT to continue as our future QB whereas signing Kaep could lead to a QB controversy in the the future not to mention the ongoing controversy with CK.
Just simply the path to least resistance while continuing to build for the future.
P.S. I'm pretty sure CK would not sign for less than what Cutler did!