Not true:That's the reason Kakashi says 'Sasuke'You must be registered for see images
Sasuke is the only person who shares the same blood with Itachi.
Show me a scan of this.Nope, kakshi was unaware of the existence of any other uchiha. Itachi himself debunked your belief when he said that genjutsu can't be used against those with the same eye power(e.g MS vs MS) yet he was sure KA would work on sasuke who had EMS at the time.
Tsukuyomi can get countered by any other MS user