I've also seen variance in hanmi/kamae in Aikikai: hands up, feet straight ahead, raised back foot (kendo influence, I believe), etc.
Everyone (well, from what I've heard explained) seems to agree that hanmi/kamae in aikido is all about standing as if holding a sword. Though there are certainly times, many times, when the hips are not perpendicular to the center line during sword kata. And feet placement can certainly vary among styles.
Has anyone seen video/pictures/experiences of O'Sensei that clearly show his feet in hanmi/kamae both pre-war and post-war? I have one video tape of O'Sensei pre-war, but I don't remember his feet being shown too clearly.