The scout is always assumed to be awful because you never take enough green cards into hand. In this game your opponent finds an alternative use for it, rearranging the top of his deck so his grand markets and peddlers are drawn before the treasures. Compared to silver it is a faster cycling card, it can help link loans to copper, it can help start conspirator chains, and it helps draw green cards into hand for a vault. His end game deck is likely to be peddlers, grand markets, both clogged by provinces, so the scout will get long term use too. With all that, is it better than silver here? Probably about as good.