One of the elders is normally the field group leader as he ( in theory ) is supposed to know the individual. Normally another elder comes - sometimes from the service committee ( CBE / Service overseer / secretary ). A MS will tag along if it is a genuine "encouraging" shepherding call ( but these are very rare - most visits are for counsel purposes).
I was a JW for 40 years and had one shepherding call on me all that time and that had a counsel element. Conversely , I was an elder and probably made only 2 or 3 genuine no counsel shepherding calls during my 10 years.