There's quite a few. Anton Stralman, Torey Krug, Ryan Ellis, Tobias Enstrom, Jared Spurgeon, Samuel Girard, Tyson Barrie, Dmitri Orlov, Shayne Gostisbehere, Andy Greene, Sami Vatanen, Will Butcher, Joakim Ryan, Alex Goligoski, and Francois Beauchemin used to be a top 4, Not to mention that a lot of the premier defensemen in the league aren't exactly huge either like Subban and Giordano are only 6' and Doughty is 6'1". It's not like they're a majority or anything but there's quite a few and there's a huge shift in what skills matter for NHL defensemen.