I've only actually seen him a few times, so it's primarily based off what I've read or heard from a friend whose seen him a few times. From my understanding he's Dekeyser with more offense. He has the size, range and skating, and he's good at both ends of the ice. Not to mention that shot.
As for Jensen, I don't know. I just don't think he's done enough to separate himself. It sucks losing that speed, but really that's it with him. I mean Marchenko and Ouellet bring the same defense, and can still occasionally chip in on offense. Basically I see Jensen as an average middle pairing guy and I think Morrison with time, could be an above average one or better.
Edit: It seems you're a fan of Jensen, so I should note I don't mean to disparage him. I do like him, I just don't know that he has a future here.