Ronan may well have been what is known as 'a lovable rogue'. What is in no doubt is that without him Caroline would never have started nor re-started in 83. The fact that he could extract money from others made and saved Caroline but....the rogue part of the description looks likely to still be very true.
A great man who could get things done and did but often at a cost to others.
The biggest achievers usually have a downside to their characters. Ronan was a hero to me and many others but he was no angel.