Being in the Flock doesn’t say you are saved, that is where we are missing each other.
I haven never seen the connection you are making between the “Flock” and Salvation.
The Flock is how you are guided by the Shepherd to salvation.
Otherwise the parable would go something like ... “the lamb was born but yet not a lamb because he chose not to be part of the flock nor a lamb as God would want it to be”, that doesn’t make sense at all.
This is how Jesus taught.
http://www.allaboutjesuschrist.org/parable-of-the-lost-sheep-faq.htm
The Flock is how you are guided by the Shepherd to salvation.
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Source ???
Scripture ???
From the Christian Bible please...