I'm a pastor who has pastored large churches and small churches over the years. I have been a solo pastor and have had several pastors under me. The NAT is silent on this. Every church has different needs and I would say that since the Bible is silent on this issue, we (church members and leaders) can exercise prayerful discretion on the best way to meet those needs.
Thank you for your reply Mike.
I have always been in a one ruling pastor church for many years, but recently this ? was raised in my mind when reading in Titus 1:5 it says to ordain elders not elder in every city.This caused me to search through the N.T. scriptures and it always says elders for a church not elder.My Pastor said what you said, but the N.T. isn't silent on this thats why i asks the ? here to try and get a clearer biblical anwser.