If you believe that, then why do you feel that Jesus chose 12 Apostles? I’m not being sarcastic, I’m trying to understand why you feel Jesus didn’t need shepherds for His flock after He ascended and His following grew...
To preach the gospel and make disciples.
Nobody said that He didn't need shepherds for His flock.
Jesus gave them their assignments, and gave gifts to the church through the Holy Spirit, but they and we are ambassadors for Christ, not mediators. They have the roles of apostle, preacher, teacher, etc, but not mediator.
That role belongs to Jesus alone. JESUS is the only and only mediator between God and man.
There is no need for any other mediator between God and man nor is there a need for any mediator between Jesus and man.