Interesting stuff.
Back then also, the tour was divided, and so this made players achievements "different" to todays. The old clay-grass divide was in its peak. I don't think of this era as weak at all, because there were so many "good" and "very good" players who fought hard to be better, but it was very fragmented, because of the contrast in surface speeds. Blokes still threw shapes though. Kafelnikov was a huge disappointment because when he first arrived, he looked like he could win on all surfaces. He won halle on grass a few times, I think. He snagged an FO. Won Oz. But he played way too much, chasing the money and not showing any sense at all when it came to timing his rise for the slams.
I think Rios was too physically a lightweight to have been considered "heir apparent" to Pete, but could have been a Hewitt, and he was expected to shine on clay and win big on hards. More so than Muster, who was strictly a clay dog. But funny enough, Rios best performance in Paris was only QF, if I recall. Rios was mentally not the most sound, and for all his surly tough guy demeanor, I consider him to be too mentally weak to be a great player, as witnessed in the way he dropped a massive calf in his only GS final. Moya is another bloke who I thought would win more.
If Rios was an under-achiever, Henman was always an over-achiever, I felt. One of the most likeable and honest players, in terms of his commitement and effort, and it drew great rewards. He was world #4 at some point, which is none too shoddy. Guga was indeed a clay god, one of the five great claycourters of the open era, alongside Rafa, Bjorn, Lendl and Mats, but unable to translate that into anything winning off the dirt, although his win at the WTF was special, as you noted, in being the only man to beat Pete and Agassi in the one event.
Great blog, Dude! :clap