Where did he say that you fool??:
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He said 'eye power' , as in why they were'nt using the rinnegan techs because the rinnegan was helping to subdue them.
Learn to read. It had nothing to do with just 'sharingan'
If a normal 3 tomoe sharingan can control the kyuubi, why did it say that you need the mangekyuo to do it on the uchiha stone tablet????
Well said!
No 3 tomoe alone in existence has ever been able to perfectly control/summon the kyuubi. If that were the case, why did'nt kakashi use his sharingan to tame naruto??
/post
But controlling the kyuubi is not a simple feat. This has been emphsized many times in the manga. Its even written on the uchiha monument the techs required to control it.