C. F. Keil and Franz Delitzsch on 2 Kings 25:28

2Ki 25:28 “He spake kindly to him (cf. Jer 12:6), and set his throne above the throne of the kings who were with him in Babel.” This is not to be understood literally, as signifying that he assigned him a loftier throne than the other kings (Hitzig, Thenius), but figuratively: loco honestiore eum habuit (Ros.). The “kings with him” were dethroned kings, who were kept at the court like Jehoiachin to add to its splendour, just as Cyrus kept the conquered Croesus by his side (Herod. i. 88).