Academics, with more recourses and training at their disposal, should, no doubt, be able to come up with answers to the questions raised in my previous posts, me being a mere [retired] hewer of wood and drawer of water.
A hint--find out when the Campbells built the first Castle of Loudon, a short distance East of the existing ruins. This should give an approximate date for the burning of Auchruglen.
Blaes map of the early 17th. C, shows the site of Auchruglen on the South side of the River Irvine. There was possibly some traces of that edifice still in existence at that period.