Thousands of anons post only once under one IP. Even Hotwheels posted only once (Where he was identifiable). There could be any number of reasons for that.
-Mobile, using wifi hotspots
-Switching VPN after posting
-Redditorfags who post once, and are too scared to come back.
-Disconnected from internet, returned with new IP
-Different people
Your signature does not make you special. Your actions do.