The strictly better/power creep issue is being played with a bit here
Scavenger is much, much better than Chancellor. It's $4 instead of $3, but since they're both terminals I can't think of many situations where that makes a difference (you never want to open chancellor/chancellor, for example). I'd say it's an even worse example of power creep than Thief/Noble Brigand.
Spy's attack is incredibly weak to the point of not being noticeable (which is why Donald X could throw it onto scrying pool when he thought alchemy was short on attacks), and that's the only thing it has over Ironmonger, which otherwise severely outclasses it.
Procession would be strictly better than throne room if "up to" was in the text, but it isn't, and in many games it will kill your good $5 actions, so yay for that.