In my opinion Ronnie would not do very well at strongman comps. First off he is a little on the short side at 5'9" whereas the average strongman is 6'-6'2". I am 6'2" and it isn't uncommon for me to be the shortest guy at a comp. Secondly he wouldn't have the functional strength to compete. This has been a failing of American strongmen for years, they are weight strong but not funtionally strong in off balance movements. Thirdly he isn't very mobile and that is a must in the new strongman comps as half of it is running around carrying things. Like most of the guys on that amount of AAS he breaks a sweat standing still. Even Pudianowski who is a monster isn't anywhere near as big musclewise as Ronnie plus is four inches taller and weighs less. There is some carry over from powerlifting to strongman but not a huge amount. Just being strong is helpful but not everything, it takes a lot of practice and total focus to be a pro. Lastly Ronnie is getting a bit old to be switching sports especially to one that is super tough on your body like strongman.
Cheers,
Scotsman