It's rare for any two bodybuidlers' absolute best showing of their career to both be in the same show at the same time, doesn't mean it's difficutl to tell who is better between the two. During the 96/97 shows that Nasser and Francois competed in together neither were totally off, both were close enough to their best showings, but Francois' physique faded in comparison to Nasser's, judges agreed too.
agree nasser beat him fair and square, like you said, we'll never know, some will speculate he was on the way down, others that he would improve.
In a feature when he came out with the collitis revelation for having retired, he did say in MMI that he had been struggling with it for a while, not knowing what it was yet, so that could be a factor hindering his condition on stage
Either way, I prefered his physique, and he still felt like a new guy, a rookie with potential. Shit, back then, I didn't think nasser could get bigger, nor ronnie, who knows maybe francois couldve improved too