The text of "The East Bank" location card from the Hunt for Gollum deck says "ally cards cost one additional matching resource to play from hand" when its the active location. (Emphasis added, of course
). As I read this text, there would be no additional cost for playing Gandalf from your hand; i.e., as a neutral ally, there are no "matching resources" involved. To this end, in the Core Rules, under "Paying for Neutral Cards," it states that neutral cards "require no resource match to play."
Any thoughts from more experienced players? (I apologize if this is covered in the rules, errata, or FAQ somewhere -- I did look for an answer and didn't get a match when I searched the forum here for "east bank" either).
Thanks!