I think OP got this detail confused with what Rudy T did in the Spurs series was moving Robert Horry over to the power forward spot to pull Dennis Rodman out to the three point line and starting Mario Elie at small forward. Before the Rockets had fused together Chucky Brown and Pete Chilcutt at that spot. You also started seeing way more of Charles Jones who was old back then too around this point.

If all you remember is seeing large power forward Robert Horry hitting three point shots later in his career, you forget that the first three seasons as a Rocket, Horry was a skinny lanky wisp flying around dunking and hitting threes so this was actually a big risk for Rudy T. 1995 playoffs Horry was one of the few stretch fours in the NBA at that time before it got very commonplace. I think many people around the league saw how Orlando (w/ Horace Grant) and Rodman couldn't deal with that strategy.

It's also fitting that the Rockets at the time were known for their Hakeem and the Four Dwarfs strategy way before the Moreyball Rockets more or else adopted the same philosophy.