From the video

Kyler Murray to me clearly in this tier. Every year of Kyler Murray's career, he's been a top-12 quarterback until last year. He was a horrible fit for the Drew Petzing system... Kevin O'Connell is an absolute quarterback whisperer... I could see a potential leap from Kyler Murray. I don't think it is particularly likely. He ran quite a bit at Incarnate Word and at Washington State. They did not use him as a rusher last year in Tennessee.
STACKED’s take
System rebound likely with O'Connell, but rushing upside uncertain.
Murray was a top-12 quarterback every year of his career until last year, when he was a horrible fit for the Drew Petzing system. The Arizona Cardinals were terrible at every level (offensive line, defensive line, wide receivers). With Kevin O'Connell as an 'absolute quarterback whisperer,' Murray should rebound significantly. However, the source sees only a potential leap and does not consider it 'particularly likely' that Murray will add rushing production; he ran frequently at Incarnate Word and Washington State but was not used as a rusher at Miami or in Tennessee last year. The source suggests monitoring preseason and early-season usage to see if Brian Daboll's offense will add rushing production to Murray's game.
Kyler MurrayQB · MINPlayer page — value, ADP, projections, and every insight