Joachim Hansen why no UFC?

Simen - 
Steve4192 - 
RandG -  they basically screwed him and disrespected him after the Pride takeover, so he doesnt want anything to do with them

he's a man of principal, and thats respectable

They didn't screw him.

None of the Pride contracts carried over as part of the sale, so Zuffa had to negotiate new contracts with each fighter. They felt Hansen was overpaid, and their contract offer reflected that belief. Hansen just chose to be butt hurt because they didn't value his services as highly as DSE did.

If the contracts didn´t carry over, then why did Hansen have to wait out the remaining year of his contract before he could fight for another organization?

There was probably a matching period and Hansen never found any offers to his liking. So he had to wait for the matching period to expire.