Other equally-valid explanations for only Higgs being able to see the Vozzler (off the top of my head) that don't require the leap of logic that he's really several centuries old:
  • Only the truly humble can see him.
  • Vozzler picked him for some reason.
  • He was exposed to something onboard the sub he served on. Anybody else from that sub would do just as well, but Higgs is the only one here.
  • Only blonds can see him. Before anyone asks, Agatha is a blonde. Completely different.