According to the metaphor in John ch 10 those that COME OUT of the sheep pens ARE united for that is the flock.. Those in the sheep pens are merely clubbers or religionists..
The flock was/is/ and always been united.. various sheep pens are just "holding pens".. for those needing to hear his voice.. I know, I know that doesnt leave a lot of room for clergy.. But Oh! Well..
Bell-wethers!
There are always some more "leaderly" sheep.
And always a few total wackos. "Crazy Judy", I can't remember her number, was a fine robust lincoln ewe. If all my sheep were going off to port, you could count on Judy to be going off to starboard.
But to get back to the clergy, there were a few who pretty much knew that, say, if I was running them down to that end of the paddock I probably wanted them to go through the gate, and they'd go, and most of the others would follow.