Indeed, who would cry if there weren't any improved stacks at all? On the contrary, I've always disliked seeing, for example, a group of red dragons on the path, only to find out upon attacking that some of them are black. Or when some of the firebirds turn out to be phoenixes. :(
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This is definitely a feature, not a bug; GS (Guard Shift) appeared in neutral creatures as early as the second Heroes game.
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