Last season the Cardinals were 19th in Active Cash Spending, while the Rams were 26th.
With the cap rules, a team can spend way over the cap one year via bonuses, but then must spend under the cap in future seasons since bonuses already paid out are counting against the cap. In the long run, it all evens out, unless a team actually pockets money rather than spending up to the cap maximum - which the Cardinals have not done.
Assuming the Cardinals give Murray a new contract with a huge bonus this offseason, they'll probably jump to at least in the top 10, and possibly top 5 in Active Cash Spending for this season.