Feel free to explain how they put up similar results defensively if Gardiner isn't even close to Tanev defensively.
Lets put it another way, the offensive gap between them is larger than the defensive one.
Gardiner: 52.3% offensive zone starts, Tanev: 42%.
Leafs won 242 offensive zone starts, over 60 more than the Canucks. (d-men have no control over faceoff wins. More shot generation = better corsi... not hard to understand)
Gardiner finishes 52.2% of the time in the offensive zone, Tanev finishes 49% of the time.
Canucks have lost more offensive zone draws than they have won when Tanev was on the ice. Leafs had a positive differential, making Tanev finishing his shifts in the offensive zone MORE than he starts them a lot more impressive than Gardiner.
Tanev averages 2.18 goals against/60 mins of ice time, lower than any Leafs d-man.
Gardiner faced easier competition than Morgan Rielly, Matt Hunwick, Martin Marincin and Dion Phaneuf. Only d-man who faced easier competition was Frank Corrado.
Edler and Tanev face the toughest competition on the Canucks. 5v5 Gardiner only managed four more points than offensively un-gifted Tanev. So no, they're really NOT that far apart offensively, but defensively... Damn. Check your facts, man.