Tess isn't Tier S in my experience unless there is a strategy I don't know of.
She needs to play synergy opponents/good opponents usually. A good opponent comes with the risk of being killed by that player.
George The Fallen is at least a B. With the best stuff, he is simply unstoppable --- all poisonous divine shield minions. With the worst stuff, you can go defensive and not tier up much and focus on giving everything divine shields which often doesn't get you "wins" but minimizes damage so you are in the late game just because you lived.