There's more to the game than just hitting threes, which Bonner has rarely done in the playoffs.
There's defense and rebounding and making an impact in the game both in the boxscore and out. That's something Horry was masterful at. Clutch rebounding, clutch blocks (5 in a Finals game in 07 iirc), clutch defense, sneaky fouls, getting under someone's skin, driving dunks, etc. Horry could help the Spurs win a game for the Spurs without even hitting a three-pointer, Bonner never has done that.
Even if Bonner makes some threes, he most likely won't be doing all those other things. But irrational Bonner lovers won't notice that. If he knocks down 2 threes while only pulling down 3 rebounds in 30 minutes and otherwise doing nothing like the game 4 against PHX it won't matter, Bonner lovers will declare him inncredible and vomit on the forum with their nonsense.
The Spurs beat Dallas, the higher seed, with Bonner playing like Bonner-ish trash.
So TD, Parker and Manu have been able to overcome him before, for at least a round. Here's hoping he doesn't take too many minutes the rest of the way.