With Gardner out this week with a sprained ankle, the best way to go would be with Nate Curry replacing him. Nate knows the system and has played WR this year.
If McCants is ready to go, it'd be better to work him in with Curry. Maybe platoon them.
Plus, it's easier for a receiver to learn WR routes in the CFL. The SB routes tend to be more complicated, especially with the extra defender to worry about.