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I believe, it may be connected to the Russian superstition about words "последний" and "крайний" (both can mean "last"), where the former considered to be unlucky as if "last in life", and the latter to be desirible (as if "last at the time"). Usually one may find this to be connected with more superstitious parts of Russian army: navy, paratroopers, pilots et c. And because Zone is quiet mystical place to begin with, it more than appropriate to use such superstition here as well.
For some bizzare reason this screenshot reminds me about ending of Equilibrium.
Actually, in the base game Scrin harvesters have an ability: they are heal themselves in tiberium fields. While I can't remember do they do such a trick in TE, I can't say that you're wrong at all.
Still, this one looks a lot like shock trooper from the first Red Alert.