[the blog pretends to apply 1 Corinthians 4:1-5 to Christian 'leaders']
Interesting that just before this passage, Paul writes "So then let no one boast in men".
I don't see the concept of 'leadership' as used these days appearing in Paul's passage at all! 'Leadership' is very much not of the church of God. Sure there are teachers, pastors, elders, servants, ministers....all are ministers in some way. But none would be characterised as 'leaders'. Archons in that day.
It is concerning that the language of the 1980s in evangelical churches, which emphasised ministry: very inclusive, accessible, and directly connected to Christ's mission, has morphed into the worldly concept of 'leadership' that implies, if not promotes, separation, division, and worldly prestige over hoi poloi. It also leads to people being passivated and not participating in church life. After all, they have a 'leader' (a 'leader' other than Christ...who calls himself a servant, as well as Lord).
Indeed, even in business, where 'leaders' are created by a set of contractual relationships, scholars such as Henry Minzberg say there is too much leadership, and not enough "communityship" (google it). In the church, above all we are about 'communityship' and participation through mutual ministry. Let's reflect that in our language and eschew the puffed up distortion that the world's thinking encourages "For the wisdom of this world is foolishness before God".