Hmm..., diplomacy - is it an assessment based on its potential? Interesting... But what's the point of such a comparison? I think diplomacy is generally useless; you might as well consider magic or even the number of level 1 creatures capable of negating all the advantages of level 6 creatures...

You say you don't like flyers... But when defending a Castle, as in your example, Ifrit Sultans would be useful... Imagine, the walls are breached, and I don't think I need to elaborate further... And what about a trick like Armageddon? Isn't that an argument in favor of Ifrits?

I think the discussion isn't about diplomacy, but about which creatures to include in your army – creatures A or creatures B. For example, if you have two Dungeons and two Towers, the question is whether to take Scorpions or Nagas. This is where the pros and cons are considered.

The siege of a Castle is a separate matter; Castles are usually attacked when the army inside is much weaker. Or when the attacker has heavily invested in Ballistics. I just don't think that with equal armies and without Ballistics, anyone would want to attack a Castle, or that after attacking a Castle, they would immediately send in Wyverns or Scorpions, which would be quickly killed.

I agree that Ifrits are valuable; fire immunity gives them a significant advantage, and the fire shield is very effective! The fire shield makes them very unpleasant opponents; they are not easily defeated... I personally voted for them!