Not so much about styles but more about other differences in the competitors. I think Fulton had 60+ MMA bouts at that point in his career and the other guy (I believe...and hope) was making his MMA debut. There is also a significant weight difference in the two competitors.
Granted this was back in 1998 when MMA was enjoying less rules and regulations but based on the information I just provided I don't think anyone would have seen that fight going any differently than it did. Granted Bullock had no idea how the ground game worked and it was obvious, but that slam was largely due to weight difference.
As much as I love the MMA of old I do find that I prefer the pairing of equally experienced and equally sized competitors.
The mid-to-late 90s rules are what made Royce's achievements so legendary. I'm pretty sure he had the edge on experience and the gi always helped.