STR-based Zevran can do the same thing
That doesn't really come close to the ancient elven magic, though.
I'm not really focusing on gameplay here, because mark of the rift or whatever we want to call it, is actually a part of the character unlike the many other abilities you can choose to possess, since whatever Corypheus tried to do at Haven seems to have altered it, and is permanent, then is used to kill him.
Yeah, I agree, I was writing that comment while eating breakfast

But when you ask me "who is more powerful?" two things come into consideration:
1. Where did they start? With how much experience? Were they just 'hurtled into the chaos' with no or as little of experience in combat and diplomacy? Or were they with a decent amount of experience?
2. Where did they finish? Or, better yet, how much did they develop on their own, with no one backing them up.
When I look at these two questions it instantly comes to my mind Warden and Hawke. Warden is with no (Magi origin for example) or little experience (Dwarf Noble, Human noble) at the start. But just depending on their (yours as the player of course, but their) skills, willpower, determination, cunning, etc. did they come to where they are at the end. Warden constantly leads, even Morrigan at the start says I can give you advice, but that's it, Alistair rarely even does that. So, they are there to back Warden up in the fights, but when it comes to crucial choices, Warden makes them all from start to finish. Hawke is pretty much the same for me, he/she really has very little experience, but comes out on top (started from the bottom, now we're here
). In Inquisition Inquisitor is always with much more experience than the Warden (any choice) or Hawke, maybe Trevelyan mage isn't really? But that's it. Others are experienced, at least I see them like that. And the Inquisitor wouldn't become the Inquisitor without the backing up of the advisors, their agents and pure luck to acquire the mark. The Inquisitor is more an image, a title, and you have it from the 20 hours + of the game, Hero of Ferelden and Champion, you have to work haaaaard to be that person. My opinion, anyways
