What’s the significance that Amasiah was singled out as a volunteer in 2 Chronicles 17:16?

2 Chronicles 17 lists Jehoshaphat’s commanders and soldiers: 15 next, Jehohanan the commander, with 280,000; 16 next, Amasiah son of Zikri, who volunteered himself for the service of the Lord, with 200,000. What’s the significance that A…