Just keep in mind that 100 is absolutely perfect, meaning never make a mistake and to have mastered absolutely everything there is to it. Tiberias currently rated 98, would that be fair? Is he 2 points away from being absolutely perfect?
Perhaps he is the best inf player NW has ever seen, but that does not mean he has perfected the entire inf class in this module, meaning 98 is somewhat off no?
I'd say you could possibly put 96 as highest, considering this would be a fair rating for Tiberias and/or other players of his caliber, it's not perfect and shows he has weakness (as does every player) but also shows he is close to perfecting it and shows he's dominant.