In 2008, Jyles and DD battled for the #2 job behind Crandell. Despite what many considered to be a better showing by DD in camp and in pre-season, Jyles opened the season as the #2.
In this role, Jyles was the first to step in for Crandell in Week 2(?) or 3, I can't recall...whatever, it was in BC. Jyles was bad, and got yanked at the half in favour of DD, who, largely on the back of Cates, got the win. DD then started the next week in Hamilton, and 2 more after that, winning them all before getting hurt in his 4th start. Many fans felt Jyles, by virtue of coming in the Perry trade, was given the first chance at the #2, even in the face of a better performance by DD.
Jyles did start once in 2008 in that weird QB carousel Kenny put us on in late 2008. He did not do well.
2009 camp had basically an open competition at QB, and DD won the job. Jyles was #2, and thought by many to be decent in that role. He played a quarter or so in Calgary and did okay. The rest of his work in 2009 was either short yardage plays (which he was generally horrible at) or garbage time.