Sims are great but...
Here's my two cents...
The sim gets most of it's aero modelling data from flight test, specifically it gets it's data for manoeuvers that are carried out inside the envelope. When you start going outside the established boudaries the sim is extrapolating. So to say you've seen something demonstrated in the sim and the nose wheel never deviated from the centerline is fine, but how far was the model extrapolating in that scenario? I've looped and rolled the Challenger sim, strangely enough beyond +30 degrees of pitch it behaves remarkably similar to a Cessna 150 aerobat - why, because beyond 30 degrees you're outside of the realm of flight test collected data.