Larry, I am a member now of a church which averages around 2,500 on Sunday morning. Each major ministry (children, youth, college/career, singles, young adults, adults, seniors) are all made up of large groups, or smaller "churches" within the overall church. We're talking over 300 children alone, over 270 youth, etc. etc. If you asked each of these groups who their pastor is, they will undoubtedly say it's pastor so-and-so, the youth pastor, or pastor so-and-so, the senior adults pastor. They all know who the senior pastor of the church is, the one who brings the sermon more times than not, but their pastor is the one who ministers to them directly and heads up their particular group.
Now, when we have a staff vacancy in one of our ministries, the senior pastor always heads up a search committee, but the committee is otherwise comprised of a couple of elders and the rest active members of THAT particular group, even down to the children (we have had children on a search committee, but its obviously been as nothing more than a happy feel-good position. It sure does put a big smile on those kids faces to know the adults of the church actually care what they think, however simple their opinions might be. (Sure wish most Baptist churches felt that way =(
This manner of organization and staff selections has worked wonders, as we don't have internal conflict, we don't have ministries vying against each other, and most importantly, we have a senior pastor who allows these other pastors (and no, they're not simply "staff members") to progress and run THEIR ministries as God leads them. It is, in fact, THEIR ministry. They are PASTORS.
What I hear you saying is the SENIOR pastor is the only pastoral post authorized Biblically. I disagree. I would say the position of PASTOR (without the qualifier) is actually the position setup by scripture. That being said, it is possible and more than probably in big churches for their to be small churches within the whole, with each of these smaller churches able to function independetly of the whole, of course keeping with scriptural basis and fundamentals.
I kind of understand what you're saying, Larry, because I was part of a very small church for a few years, and I saw first hand how the pastor struggled due to the vying agendas. But looking back on it, I'd say it was largely the senior pastor at the church not allowing his junior pastors to minister outside of this primordial and absolute authority. Looking back, I can see a bit of insecurity in him, and I think all of us deal with that at some point(s) in our life.
Just my two cents.