Around 6"6+
I can think of a few notables.
Franklin
Kernahan
Beasley
Simon Madden
Darren Bennett was looking likely before he trundled off to the NFL.
Your argument is flawed though.
A 200cm ruckman was a rare thing, even 10 years ago, if guys were around that height, they were invariably played in the ruck, not as a key forward.
Let alone 30 years ago, 6"0 key forwards were common.
Everitt and McKernan would of made fantastic key forwards if they were allowed to play there permanently.
I don't mean to split hairs pykie cause you're usually right on the money but if we're gonna highlight the difference between 6'9, 6'8" or 6'6.....
Beasley, Kernahan & Franklin are all under 6'5" & 1/2 & as far as Hale goes, they are all exactly 2 inches shorter than him. Even Simon Madden; arguably the best ever ruck / forward, was over an inch shorter than Hale is & he is indisputably a legend of the game.
Tippett is the exception to those mentioned but i'd say he's the much more in 'new' style 200+ player when compared to Hale given he's in a totally different league in terms of all round athleticism.
In many other teams Hale would be more valuable as a starting ruckmen who could be very dangerous as a part time forward.
Hale's problem is that he's become the 3rd preference ruckman at North, effectively forcing him to try & stake a permanent claim in a position that should really be only part time.