The End of the Primus Pilus

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Interesting transformation. However, was not a recent thread resurrected about the primus pilus suggesting that it may not be a person rather a unit or file....i.e. first file not first spear? So if the primus pilus had a change in position it suggests that the title was bestowed on one person. You would not have an entire unit becoming tax collectors. Maybe primus pilus is the title given to the centurion of the first file; first century (file) of the first cohort. This person was probably high on the administrative level that going from the field to tax collector was not a far stretch.