Cardinals QB Kyler Murray to miss 4 games, backup McCoy released as Dobbs and Tune compete for starting job

Kyler Murray will miss at least the first 4 games due to knee surgery.
The Cardinals released veteran backup QB Colt McCoy.
Newly acquired QB Josh Dobbs and rookie Clayton Tune are competing for the starting job.
Coach Jonathan Gannon has not yet named a Week 1 starter.
There are concerns about the Cardinals' QB situation and their prospects this season.