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Well, if there aren't any green Knights, then, in my opinion, the rest of the neutral creatures don't create any significant imbalance. Those same Knights have weaker stats and HP compared to most troops of their level, and they only have a 25% chance of a deadly strike, which often may not activate because direct damage will be higher, and the advanced weakness strike – I don't think that the current neutral creatures are imbalanced or significantly imbalanced – unless the value of the Raise Dead spell increases, as it is not very useful without BDP (Battle Damage Points).
And if they are added, there will be more choice of troops, tactics, etc.
Phoenixes are an exception, but they are not always better than Lava Dragons and are more in the category of "lucky once," rather than imbalance. You could, for example, reduce their chance (30% downgrade, 30% normal upgrade, 30% alt-upgrade, 10% Phoenixes), and the rest would be equally likely.
And playing with completely equal armies is not very interesting; there should be small deviations in one direction or another, sometimes the random chance will favor one player, and sometimes the other