The letter to Titus is concerned with order within the church. In 1:5 Paul writes to Titus,
For this cause I left thee in Crete, that thou shouldest set in order the things that are wanting, and ordain elders in every city, as I had appointed thee.
Paul proceeds to tell Titus how to do it. Notice Paul instructs Titus to appoint “elders [plural] in every city.” It is interesting he did not say appoint elders [plural] in each church.
Is it possible that by now there were several house churches in each city and each house church had a singular elder? Therefore, Titus was to appoint elders, one for each house church? The text here, and in 1 Timothy 3 allows for this. The doctrine of multiple elders in every church is not a slam-dunk.
Therefore, Paul states the qualifications and functions of elders, and their pastoral work. It is by these qualifications that a church should evaluate their pastor.