Here is a comparison of both of their first all star years. Hornacek only had this one, but mainly because he ended up playing in Utah where he was meant to be the 3rd option, and not many of those get all-star nods.
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So in their prime, Hornacek all day every day. Beats him in literally every single category. Houston did have a couple of seasons better than this, but they weren't all star seasons.
Even in Houston's statistically best season compared to Horny's all star season the differences are noticeable.
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More points and marginally better free throw shooter. Hornacek overall far more efficient and lit up more of the stat sheet with 5 ast and 5 boards per game to Houston at 3 of each. In steals especially, Horny at 2, Houston at not even 1. Defensively Hornacek was a sneaky good defender, and I would argue better than Houston, as Allan was primarily a scorer.
So if we could have ADDED Houston in 97 or 98 that would have been huge. But at that time, Hornacek was still more efficient, which was really valuable given the style of play we had at the time. Even comparing their 96-97 seasons they aren't that far off.
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Horny still has the edge in shooting overall, and assists and steals, while points are identical. That would have helped us to have Houston that year, but we would have lost something on the defensive end, which was our core identity at the time.
And in 98?
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This is really where Hornacek was falling apart on those knees, yet he was still remarkably consistent across the board. Even at that his shooting was stellar, and his assists were solid and still bringing in over 1 steal per game. If we could have added Houston the summer of 97 that would have been huge, but replacing Horny with Houston would not have been enough to make the difference. Hornacek was still hugely valuable to our game, especially with our style of play, and gave us a much-needed secondary play-maker. Hell at 4 assists per game he would be one of the better play-makers on our team last year, and that wasn't even close to his focus.
So in my book, replacing Hornacek with Houston would not have been enough to get us over the top. Adding Houston may have done it, but I would argue that the defense we would lose, in either Russell or even Shandon Anderson, would off-set the offensive gains.
So no, Houston as a replacement for anyone else on the team was not the answer. As an addition it could have been a difference-maker.