Just watched the demo. Yup, if there was any player on the server at that time who could've been DDoSing, its defenitly Logan. The laggspike starts in round 3, at a point in time when logan is dead. According to his playstyle in the previous rounds (Being AFK), he was probably alt-tabbing. This behaviour is continues throughout the rest of the game: Logan gets AFK, and the lagg gets worse. Then, in round 7, logan chats:
Code:
-=Logan5=- : admins, try a map change to flush the server
-=Logan5=- : might help
Presumably Logan was trying to force a map change by lagging out the server on a map he didnt like.