I reckon Shawn at his best would beat Ronnie at his best... and if he wouldn't (or didn't), then he SHOULD!!
Bodybuilding shows are supposed to be judged based on: relaxed stance, mandatories and posing. Well then....
Relaxed (front).......Shawn wins, Ronnie's arms are held out at 90 degrees, his torso is bloated and abless
Relaxed (side)........Shawn; visible serattus, ripped obliques and intercostals, better balance
Relaxed (back).......Shawn, heart shaped back with long proportioned lats and an xmas tree
Front double bi.......Ronnie; more mass, better biceps and upper body thickness
Front lat spread.....Ronnie; more mass, wide clavicles
Side chest............Shawn; Ronnie can't do a side chest due to his stomach
Side tricep............Shawn; abdominal detail and tricep detail
Rear double bi........Shawn; by a country mile!! Ronnie's traps overpower his lats and his back is diamond shaped
Rear lat spread.......Ronnie; just too much mass and his gut isn't visible
Abdominal/thigh......Shawn; not only because of the abdominal detail, but the thigh quality
Posing routine.........Shawn; Ronnie should be disqualified during the posing round as he's awkward, ungainly and completely ignores the crescendos in his posing theme because he's too busy waddling around doing the raise the roof gesture and hitting the same few belly-breathing poses over and over again
......and Onlyme, Shawn did win big bodybuilding shows, among them at least 2 Olympias against none other than Dorian Yates.
The Luke