Why? Maybe he just wanted to concentrate on playing and not be distracted by long drawn out negotiations.
And?
1. Lots of people leave jobs everyday with no definite new job lined up.
2. Just because there has been no contract offers for Dargo in the press doesn't mean that there haven't been any, lots of contract offers are kept confidential.
3. Maybe it was an excuse, maybe it was the truth. It's not a new thing to use the press for your own advantage, and there will be lots more of it happening in the future.
I agree with you that everyone will have their own opinion, as is their right, and these will probably never change. But he has to play the situation entirely for himself, or himself and his family. As stated, they might have had trouble settling in the highlands and maybe why he has decided to move with no clear indication of his next club.