Just a few minutes ago in a rather crowded Portuguese server, Avalanche, I met Sensei! I have met him once before, using the tracker that is below, but this time I met him from a tweet saying his location. I was able to get the stamp (When I last met Sensei there were no stamps) and even add him to my buddy list. Here’s a picture, and a tracker that has worked for me in the past:
When ever Sensei visits the island, it says he’s online, but that doesn’t mean he’s on your server. So buddying Sensei can’t work as a tracker. 😦 There’s only about a week left in the party, so why are you still reading this- get tracking, and good luck!