....I think he's quite pleased with himself that he got it right about Michael, which BB didn't really make it that difficult to 'suss' with the suitcase thing..he is a detective, so it would have been a bit embarrassing if he hadn't suspected...and because Michael's gone now and he felt as though he had the housemate's attention with all his theories, he's now creating another one..I bet if Wolfy was up for eviction and went, he would say it about someone else.....

They are, near all them, now looking at other housemates and thinking there is someone else that could be a planted actor or mole,it's not just Dan doing so.
All of them are paranoid now.
That is also probably the result that BB wanted form the twist too.

Dan didn't just get that Michael was a plant,he worked out he must be a professional actor too not just a mole housemate.
He saw through the diary room interviewing with Michael too, there were many things Dan saw and worked out that the others didn't even dream of.
In fact he and eventually along with Sallie, as they agreed on the more instances they were suspecting showed they were right, then went on to get all near all spot on.
I give him and indeed Sallie too credit for that.

I have said also on this thread, after the Michael twist, I would also be looking at the others if I were a housemate thinking is there another actor in the house.
Right now I also too would be thinking from the erratic behaviour of her,that Wolfy could be another actor.
It is only because I already know she isn't that I don't think she is.

Dan was a Detective, however on from that, I found it incredible that any housemate maybe even considered their belongings were shredded.
That may well have been the spark that ignited Dan's suspicion since that would have been a criminal act anyway to have destroyed others belongings.