But he needed to be there to do it; without the island's power, he can't get to the island. Frustration, thy name is Kemmler!
You really think that Kemmler couldn't have figured out or found one of "the Ways" to the island? Or simply rented a boat once he was Warden?
coughCoughpowercoughCough
I'm sure if we crowdsource possible motivations, we can figure out what Kemmler wanted.
Which is kind of the point isn't it? If that is what he really wanted, Kemmler could have gotten it. All these pronouncements at conventions sound so cool, everyone loves them and we speculate endlessly on them, but it isn't written down.. Some of it makes no sense if you care to think about it in terms of the story.
I expect Kemmler punched it in the nose, and then they were friends.
That's how Harry (says he) did it.
Not that simple though is it, because we know Harry's motives, it's like he was looking for a short cut and bushwacked though some brush, got his short cut but found out later it was all poison ivy he cut through.. Kemmler would have been much more delibrate about it and had a goal in mind when he did it.. Power sounds cool, but to what end?