If anybody expresses doubt to me about Kamae, I generally go into a wrestler's crouch and show how similar it is. Shinzentai and Kamae are not that different, either. But many other Aikido styles don't use it, so YMMV.
Wrestlers crouch is more akin to jigotai, not shizentai.From my experience Jigotai is not applicable on Aikido.Of course some Judo masters like Kenshiro Abbe did not advocate this posture.Jigotai may well have been stolen from Sumo?? Cheers, Joe.