Look at the list of users browsing the forum. Click on the one that will make this whole thing completely obvious to you.
(hopefully he doesn't leave before you do this. He seems to be pretty pre-occupied with that thread, though.)
Well he's been doing it for DAYS! And never made a single post. That level of lurker/creepster status needs to be acknowledged and questioned!
he's probably 'working' through it slowly and wont see the message on the last page till he 'finishes' the thread