Hard evidence is in. The bulk of benefits from the income tax cuts that broke the Kansas budget went to a small number of wealthy individuals, while Kansans at the low end of the income scale actually paid more.
The Kansas Department of Revenue publishes an annual report containing many tax collection statistics. Data on individual income tax receipts takes time to appear, but the 2015 annual report (page 22) now shows information for tax year 2013, the first year the tax cuts were in effect. The annual report from a year earlier (page 22) provides tax year 2012 stats. Place the two sets of information side by side (chart below), and it becomes easy to see how the benefits were distributed.