Stajan, Versteeg and their combined 5m can be replaced internally with the likes of Hrivik, Lazar, Foo, Phillips, Mangiapane, Dube, Pribyl, who have all played centre and/or wing, on ELCs. Kulak is steady but he's replaceable by Andersson and potentially even Valimaki. Versteeg will be harder to replace than Stajan, but that's not a difficult trade to make for a middle six winger.
That leaves something like 6-5-8.5 million between Jankowski and Rittich? Hell, even Bennett ahould be able to handle 4th line minutes at C. Rittich shouldn't be getting more than 2.5m and Jankowski should expect a bridge around 3m at MOST. Don't quit your day job - I get you don't know the Flames that well, but your approach to cap management is flawed at best, and it helps to know the roster/system.
P.S. It'd be far more worrisome to think of what Tkachuk's first RFA and Ferland's first UFA contract will look like in 2 years. Also, the Seattle expansion draft rules could actually hurt Calgary this time around.