Actually we do know that. Woodward viewed Klopp in very high regard and sounded him out personally (said he could manage adult Disneyland), he especially liked the low wage bill Dortmund had and was no doubt licking his chops at the financial miracles Klopp could accomplish.
Klopp chose Liverpool because he had less paperwork to sign and less commercial responsibilities.
I had talks with other clubs and they didn't sound like a football club. It sounded like marketing, image, you need to sign this, you need to sign that. And I thought 'wow, that's not the game I love'.
This basically rules him out of Madrid, Barca and United who are huge on marketing and image rights. The commercial work these 3 clubs do is huge. He can't handle being manager at a club like this.
Your still making an assumption and treating it as fact though. Just because Klopp possibly prefers to avoid jobs at the top teams doesn't mean he wouldn't succeed there. However I do agree that his style is probably best suited for a side like Dortmund or Liverpool, teams who aren't short on talent but are not the dominant sides in their league. He's a fantastic manager, so it's hard to say how he'd adapt if put in that situation.
