when in spectator mode, i would want the game to focus on a board instead of showing me all of them, so that i don't have to pick a board to look at. i don't know whether spectating the previous winner is better or if spectating a random player is, but either way should be an improvement, in my opinion.
also side note, it's kinda awkward when the game starts with you spectating, and you don't even hear the game intro thingy. i think the auto-random focus will sort resolve this at the same time.