So are people who think something said in part 1 is going to mean anything when Kishi have Bee and Itachi say the exact opposite in the more current story. Part 1 said Hiruzen was the God of Shinobi yet Shippuden says its Hashirama.You're already out of bounds. Now you're treading fanfic.
That's not the same thing, Uchihs unlock that power when they get MS as Itachi and Sasuke both said so that's an ability they gain. Both Madara and Obito managed to control Kurama with their 3 Tomoes after already having their MS unlock and having mastered their Sharingan to that point. genjutsu affects the senses by the genjutsu user's chakra entering the victims brain, Bijuu's brain aren't located where the Jinchuurikis brain is and their chakra connection is where the seal is. Plus no Uchiha has shown to place a Bijuu under their control or even effect them instead of the Jinchuuriki, their power doesn't let them to just bypass the Jinchuuriki.no. a 3T sharingan is enough to subdue a tailed beast. a tailed beast (as shown several times) has no real defense to sharingan genjutsu. if there minds are linked, then 8 tails wouldnt have been able to break bee out because he would be under the same genjutsu, which again tailed beasts have yet to break out on there on. so this would show that just because a host is put under one doesnt mean his beast is.
Even when Sasuke went in Naruto, Naruto had to be there first. Perfect Jinchuurikis connections become much stronger than before they became friends. After Naruto and Kurama's link got stronger, Naruto was able to go deeper into a mentally plane to talk to the Bijuus and Jinchuurikis where they said even Obito can't reach. Also Bee said his power weren't that strong in Naruto so the power of others wouldn't be either. You can't compare the ability to control Bijuus and genjutsus used on ninjas, ninjas don't get Tomoes in their eyes when placed under a genjutsu.