Haven't noticed. What I did notice, was that the NS team with a lower geared zombie is more annoying than the nearly maxed out NS squad in my top 20. Horrible game mechanics when a G7 zombie is better than a G11 zombie. At least I can buff block or fracture a G11 zombie without one shotting them.
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Other than that, NS seem okay to me.
Probably unlucky RNG. Happens to my First order team all the time. Either they score high or really low