If Cat goes soon, Lawson may have longer in he house, but I can't see him winning it. Might have with a vote to evict, but not with a vote to save.
I have been wondering how an eviction show for whomever is out first (Cat or Lawson) is going to be handled. The first one will get the roughest treatment as they will get the full ire of the public, the media, everyone. It will be tougher than it was for Tully as this is a "bigger and better" story. On a celebrity BB in the UK a few years ago they had someone exit to an empty studio because of their actions (racist comments as I remember). Would they consider that here to give whomever time to fully understand how they are perceived?
I think Lawson knows how it all looks, particularly with what Jason said. I think Cat probably would not care initially, but become a dribbling mess trying to defend herself to everyone.
Keep watching, and vote to save David.