Question about the map "Longest Journey".

So, it's currently the 3rd month, and we've reached the blue faction's territory. We capture their castle, and then two main enemy heroes are right outside our walls. With a mage hero, I defeat the 7 stacks of Djinns, reducing them to single units, using the tactic of "cast (berserk), surrender, pay a bribe, and repeat." This way, for a reasonable 220 mana, we eliminate the hero Xeareth. If we skip a turn, Khalid, with his 45 rusty dragons, doesn't attack... possibly because of an event near the castle that we bypassed (losing all gold and wood), or maybe for another reason. In the end, he sails to the island above. Fortunately, I hire all the heroes (including finding Xeareth in the tavern) and prevent him from landing (digging and leaving one hero on a cell). For those who have completed the map, is it worth killing Khalid, and if so, how in this situation? Save 1: We defeat Xeareth, Khalid is still nearby. Save 2: We start blocking the beach to prevent Khalid from landing.