Been a Southern Baptist all my life and this is how it works.
The churches are independent in all they do, but the stick to the Southern Baptist Convention.
We dont have elders, we have deacons. Our church usually has six active deacons at any one time but there can be more that are inactive for various reasons. Once you have been elected as a deacon and ordained, you are always a deacon and it is pretty much up to you as to whether you remain active or inactive. Most churches rotate their deacons. It is not a paid position. Deacons dont run for election, they are chosen and asked by the active deacons.
Men must meet the criteria of I Timothy, chap. 3 in order to be a deacon.
In our church, this is the way a pastor is hired. A pastor search committee is chosen. It is made up of the heads of various committees within the church including the head of the deacons. They serve as a personnel committee and when they find a pastor they like for the job, he will come and preach a trial sermon. The congregation will then go into an official business meeting and vote on whether to hire the pastor. This is the way every church i have been a member of has hired pastors and youth and music ministers. There is a personnel committee that hires other paid staff such as secretary, pianist, custodian, etc. that committee is selected yearly and voted on by the congregation.
There is no rotation of pastors as in some churches. As long as he is happy to be there and the church is happy with him, he stays. As with any job, pastors will leave a church, or be asked to leave.
Sometimes a pastor will choose to leave a position as pastor of a church and work in the ministry in a different type position for a variety of reasons. It looks like pastor Shahan had done this.
Most churches have gotten away from the past times where the church owned and provided a pastorium for the minister to live in at no charge. They now provide a housing allowance and the pastor uses that money to go toward rent or mortgage on the house of his choice.
Hope this helps explain some things.