Don't think their position has any effect on the province, though I could always be wrong.
And nah I don't think this is what the "screening" process is trying to block out, more like trying to block out people who just spam stupid stuff.
It depends what game you play.
In MTW, it increases the loyalty of that province in the short term. In the long term AFAIK, it increases the likelihood of developing bad V&Vs, so try to keep 'em moving, fighting in battles, that kind of thing.
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