Re. Craig scoring Louis, I think his comments forced him to mark him that low really.
His dance wasn't as good as Denise's, in feeling or technique IMO, so definitely didn't deserve 9's from everybody (I would say it probably deserved 8's).
After the other judges got in a tizz about Craig's comments they had to mark high to 'validate' their comments, and Craig knew that, so he marked lower to make the overall score fair (I think at any rate
).