The Justice Society has such a rich history, and DC's greatest heroes have all called the team home at one time or another. There are some heroes that fans definitely want to see show up in the new book, ones that will fit in with the team and their legacy.
The Justice Society has made a few appearances in the last few years, but one fan-favorite member is missing. The second Mr. Terrific came to prominence in JSA and Justice Society of America. Taking over as leader of the team, Mr. Terrific became the Justice Society's Batman, except better because he wasn't mean to everyone and didn't keep terrible secrets from his friends.
Mr. Terrific has long been DC's most underrated hero. Justice Society fans love Michael Holt, and not seeing him among the new team is a blow to them. He needs to be in the book more than any of the other legacy heroes.