Well, the pooling of tips (whether by envelope, autotipping, or tips included) seems to be a big cruise industry mystery. I've seen posts insisting that this was done, and posts insisting that it was not. I must confess that I don't know the answer. In neither of these three tipping methods do I know what happens to my tip after it is paid.
I, for one, would like some definitive answer on the tip pooling question. I'll just bet it differs by cruise line.