Right, it was God's power being displayed to the bones of Elisha.
I don't think your logic follows concerning what the king of Israel would have done.
2 Kings 13: 20. Elisha died, and they buried him. Now the bands of the Moabites invaded the land at the coming in of the year. 21. It happened, as they were burying a man, that behold, they spied a band; and they cast the man into the tomb of Elisha: and as soon as the man touched the bones of Elisha, he revived, and stood up on his feet.
It's possible that the men doing the burying didn't wait around to see what it happened. They were running away from moabites. It's also possible that by the time the moabites went away, people had forgotten where the grave was, or it had been covered over.
Acts 5: 13. None of the rest dared to join them, however the people honored them. 14. More believers were added to the Lord, multitudes of both men and women. 15. They even carried out the sick into the streets, and laid them on cots and mattresses, so that as Peter came by, at the least his shadow might overshadow some of them.
Were they healed when Peter's Shadow fell on them? It sounds like it. Did God continue displaying his power that way throughout Peters life? Like even when he was being crucified? Probably not, why kill someone like that when you could keep using him to heal people, like Caesar and his family.
So I think in these situations, sometimes it works and sometimes it doesn't.