THe selection of Bron

 St.Patrick had a method to his conversion process,copied possibly from the early years of the Church and Justinian.
The earliest converts were from the educated and  aristocracy;the majority of St.Patrick's disciples were from the noble families and even among he Druids themselves,classes conservative by nature and therefore likely to resist change.That they accepted and adopted his teachings argues a deep seated inclination to the supernatural and a desire to incorporate it or hang it on a coherent philosophy supported by a story.
This would argue for the belief expresses by some that ICNE and BRON were at least local bigwigs .
As I indicated elsewhere the can be no doubt base on DNA studies that the origin of the line was from a tribe in the area of Monahan flanked by Fermanagh and Louth.That area and the tribe and sister tribes later became known as AIRGHILLA
However based on the timing we do know Bron and his ancestors were in the Sligo area well before that group in that collection became known by that name.
'Tribe"or family names(current form) from that area and sharing similar DNA are such as "McGuire Leonard,McManus,and the bastardized Bruen name as Byrne Breen can be found concentrated in that area.Great detail is available on this subject.