There needs to be differences. For example, marines are always described as fearless throughout the novels and codexes, willing to sacrifice anything throughout the course of battle, yet they do not get fearless. Necrons, it a similar vain, cannot know fear, it's impossible, they are metal and wire, incapable of fear. You can go down the list of races and find they would all either be Ld. 10 or fearless, but then it'd be a boring game. Tau can have lower Ld. as they don't take psykic tests, ever, and aren't supossed to be in CC.
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