Defenseman Oliver Ekman-Larsson was perhaps the best-kept secret on the Coyotes during his first two years in the NHL, combining defensive maturity with offensive vision without much fanfare.But after a first-half performance that's landed him firmly in the Norris Trophy conversation, the buzz is starting to build - especially after the Coyotes and Ekman-Larsson agreed to a six-year contract extension worth $33 million on Friday.