REGINA — The Saskatchewan Roughriders are well aware of Chad Kelly’s gunslinger style, and they’re planning to use it against the Toronto Argonauts quarterback on Friday. Kelly has opened the season with a bang, topping the 400-yard passing mark in each of Toronto’s first two games. But a closer look at the statistics — 869 yards on 53-of-78 passing with seven touchdowns — reveals Kelly’s gambling style does lead to interceptions. He’s thrown fi…