After missing all of 2014 and 25 games over the past two seasons, there are questions about whether the pass rusher can return to form. Weatherspoon has pools of talent, but must prove he can stay healthy. (We should note that the last few years the Cards have done well picking up players off the scrap heap and turning them into playmakers.)
Irving is coming off an ACL tear in November. The linebacker would be a plus addition for a cheap run-stuffer in the desert.
The Cards' front seven has been decimated by defections and injury the past two years. Adding Weatherspoon and possibly Irving could be a start to remaking that unit.