My view of the scriptures leads me to believe that there is not one person that has the role of "The Pastor" in a local assembly. There can be a lead pastor or one who is gifted in teaching in a certain area and a spokesperson for what the others have decided as a group - how large that is depends on the Holy Spirit as it is He that makes them overseers in an assembly.
Once a church has been established by a believer in an area - usually done by someone operating in the function of an apostle ( which just means a sent one to a specific group) - then there is a local governing of that body of believers.
There seems to be a "spokesperson" for the plurality of elders or pastors if you like that term better. Shepherd is the correct term used biblically but our modern day evangelical system has changed many things including elevating one person as "The Pastor".
The pastor, elder and bishop are all speaking of the same person but they are spoken of in different ways or functions.
1 Peter 5:1-3 (NASB)
[SUP]1 [/SUP] Therefore, I exhort the elders ( greek word for presbyters, elder ) among you, as your fellow elder and witness of the sufferings of Christ, and a partaker also of the glory that is to be revealed,
[SUP]2 [/SUP] shepherd ( Greek word - feed, shepherd ) the flock of God among you, exercising oversight ( Greek word for bishop, overseer ) not under compulsion, but voluntarily, according to the will of God; and not for sordid gain, but with eagerness;
[SUP]3 [/SUP] nor yet as lording it over those allotted to your charge, but proving to be examples to the flock.
We see this being done again in Acts 20 when Paul is talking to the "elders" in Ephesus ( not the one Pastor of Ephesus )
Acts 20:28 (NASB)
[SUP]28 [/SUP] "Be on guard for yourselves ( the elders ) and for all the flock, among which the Holy Spirit has made you overseers, ( Greek word for bishop, overseer ) to shepherd ( Greek word "to shepherd, nourish, feed ) the church of God which He purchased with His own blood.