Photo Credit: colts.com With Mike McCarthy officially signed as the Pittsburgh Steelers’ new head coach, it’s reasonable to expect the offense to look drastically different under his West Coast system. That shift only increases the urgency for the Steelers to upgrade their receiving corps this offseason. Along with a draft class widely projected to be deep at the receiver position, free agency may also offer intriguing options — one of them being Indianapolis Colts wideout Al