This might Not be a thorough detailed analysis, but I suppose one of the major key themes is that the messenger -regardless of whether the messenger might be a NonChristian or a New Christian because God does work in mysterious ways which is evidenced by

( Isaiah 55:8-9 ) “For My thoughts are not your thoughts, Nor are your ways My ways,” declares the LORD. “For as the heavens are higher than the earth, So are My ways higher than your ways And My thoughts than your thoughts.)

-or even if he is a believer of God/Christian who falls like King David sin with Bathsheba or even like Apostle Peter who momentarily distanced himself from Gentile Christian believers (Galatians 2:11-14)

is that the messenger herself/himself is also susceptible to falling into sin.

This might Not be a thorough detailed analysis, but I suppose one of the major key themes is that the messenger -regardless of whether the messenger might be a NonChristian or a New Christian because God does work in mysterious ways which is evidenced by

( Isaiah 55:8-9 )

“For My thoughts are not your thoughts, Nor are your ways My ways,” declares the LORD. “For as the heavens are higher than the earth, So are My ways higher than your ways And My thoughts than your thoughts.)

-or even if he is a believer of God/Christian who falls like King David sin with Bathsheba or even like Apostle Peter who momentarily distanced himself from Gentile Christian believers (Galatians 2:11-14)

is that the messenger herself/himself is also susceptible to falling into sin.

Also, to bolster the credibility of your assumptions/assessment/evaluations based on your arguments for symbolism in 1 Kings 13 , it would be interesting to note that 1 Kings 13:24 recounts the event of a lion killing the unnamed prophet who strayed away from God. 1 Kings 13:24 could be considered as a real event that confirms the symbolism in 1 Peter 5:8 bible verse which uses a lion to symbolize the devil who prowls around for someone to devour:

1 Kings 13:23-25

23 It came about after he had eaten bread and after he had drunk, that he saddled the donkey for him, for the prophet whom he had brought back. 24 Now when he had gone, a lion met him on the way and killed him, and his body was thrown on the road, with the donkey standing beside it; the lion also was standing beside the body. 25 And behold, men passed by and saw the body thrown on the road, and the lion standing beside the body; so they came and told it in the city where the old prophet lived.

1 Peter 5:6-11

6 Therefore humble yourselves under the mighty hand of God, that He may exalt you at the proper time, 7 casting all your anxiety on Him, because He cares for you. 8 Be of sober spirit, be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking someone to devour. 9 [a]But resist him, firm in your faith, knowing that the same experiences of suffering are being accomplished by your [b]brethren who are in the world. 10 After you have suffered for a little while, the God of all grace, who called you to His eternal glory in Christ, will Himself perfect, confirm, strengthen and establish you. 11 To Him be dominion forever and ever. Amen.