In 2000 Takara repainted Fortress Maximus as Brave Maximus in Robots in Disguise (who was called "Fortress Maximus" in the RiD dub but the toy was never released by Hasbro). It's only just dawned on me that the word "Fortress" comes from the Latin word "fortis," which means "brave."

Also, Grand Maximus' name just means "big biggest."