Also worth noting, an infantry unit can get a disrupted marker from one WN position and receive a hit causing step loss from another WN position in the same fire phase.
I beg to differ here. My understanding of the rules and answers of Mr Butterfield here and in CSW is that you try to maximize hits from all WN activated, but never a unit gets hit twice.
In your example, the unit would get hit and loss a step instead of being disrupted. The disrupting WN would either find another target or be wasted.