During a tournament sometime ago, someone said that the Pathfinder devilfish couldnt move with the actual pathfinders in the scout move. I found this forum post about it. I am just going to post it here so that next time it comes up, I will have easy access.
Just to clarify, this is NOT me post this in the link. It is some whiney kid on tauonline. I am just posting it here in case I need to clear it up ever.
http://forums.tauonline.org/tau/9006-pathfinder-scout-move-rules-question.html
Subject: Tau Pathfinder clarification 
22nd October 2010, 5:46 pm