I look at AVG honestly most of all. The Colts were top 10 in AVG (lowest average gain per rush).
I'm familiar with what DVOA is, and follow FO frequently. I'd point out that they ranked the Colts 4th in rush D DVOA in 2018, while rating the pass D 20th.
In 2019, given our anemic O, soft zone D, and success against the run (both past and present), why wouldn't everyone throw more against us lol...
In short, rationally, you don't go from 4th to 19th in a year without substantial injury or personnel turnover. We only fell from 6th to 9th in AVG from 2018 to 2019. This is why I say take it with a grain of salt.
Frank no doubt is a man of integrity. His willingness to be one of the first to issue a statement against racist injustice speaks volumes. The Colts have a strong leader and this is surely seen by the men he leads.