Interesting. I've been using ORATE as it knocks out a lot of the top frequency letters from the english language as a whole. But I guess the distribution in five letter words, and more so in a subset of five letter words, may skew differently.
From what I saw, T shifts down noticeably when restricted to 5 letters exactly. Intuitively, it sort of make sense -- there are a ton of short T words. ('that' and friends).
