We all know that eyes are strongest in pairs...and Sasuke has like one eah of EMS and rinnegan so that means he can utilise both only to half their potential or can he use their full power? IF he can utilise only half his techniques, his strength isn't as OP as it is made out to be by Sasuke's followers is that correct or not? I mean he could use all the techniques but they wouldn't be exactly Madara level right?
I don't know how people don't seem to get this concept, but:
It has been made clear by the manga that doujutsu that possess 6 or more tomoe like Sasuke's rinnegan or the rinne sharingan possess power that is equal to or greater than the power granted by doujutsu awakened in pairs. In other words:
6 tomoe rinnegan >= dual rinnegan
Rinne Sharingan > all other known doujutsus
6+ tomoe eyes are an exception to the "(insert doujutsu here) is strongest when both eyes are present" rule.
As for your comment about having one EMS, I somewhat think you are trolling with this thread. Sasuke did not lose his other EMS eye when he awakened the rinnegan. The design simply doesn't show in that eye. Sasuke can still use all of his mangekyou techniques, and this was even shown during the battle with Kaguya when Sasuke used amaterasu with his rinnegan eye.