He seemed to think that he and Jade were the least likely to win. How did he have that info?

He doesn't have the info he was being funny, he's a funny guy

He was having a joke. I thought it was hilarious how he just added Jade onto that sentence, assuming she's unpopular too

I think he just added Jade's name cos he happened to be talking to her at the time. If he had been talking to someone else he would have added their name.

I wish BB had announced the bottom 3 as well......

Yes it was an amusing inclusive riposte to the fact he does actually feel bottom of the pile.

Even though it's a joke, I'd bet it'll play on Jade's confidence a bit. Because Nick wouldn't have heard what we did in the diary room.

Funnily enough, even though on the app Jack, Danny, and Harriet were voted the favourites to win, on the bookies odds last night and today Nick has been second and third favourite to win.
http://www.oddschecker.com/tv/big-brother/winner