@tetsukage: heavy denial huh?
1. Yhwach only knew that because he was aware of Aizen's ability, and noticed his perception of time was off, he wasn't even using the Almighty. And even when he was using it, he was still fooled by the illusions and couldn't break it. Plus you're now comparing the sharingan to all seeing eyes?
2. It wouldn't work on Ichigo because Kyoka Suigetsu was already released before he showed up. He didn't meet the activation requirements which is seeing the shikai release so he's considered an unconnected soul.
3. Sent via sight. If Stark lays eyes on it's release. it's over.
Sorry, I had faith that you'd be able to accept facts if stated plainly, but you're really not worth wasting time on.