I think they did an excellent job of working him in that way.

They also released another clip that explains what Kanan is doing there.

Which is interesting in that it seems to contradict what they established in the Clone Wars. With Yoda discovering the cave on Dagobah to complete his training from the warrior in the PT to the wise sage in the OT.

Which is fine by me really. I had always thought there were these kinds of places throughout the galaxy that Jedi would go to as part of their training. Yoda using one to mask his presence.