What are you talking about? Butler is known strictly as a three-point shooter. He's not an overly good one and given that he's been a terrible one from around mid season (last season) on, he may be done as one, but that's absolutely what he's known for.
Even if he were shooting it better, he's not the type they need though. As I've discussed ad nauseam, they need a Neal/Belinelli type. It's even more glaring when Ginobili doesn't have his legs or isn't playing.
That's the unfortunate thing about the limited offense: It's personnel, not chemistry, related. They're not built to excel in transition and they don't have players who get to the line at a high rate, but they've made up for it with knockdown three-point shooting and in recent years, an increase in pace, which obviously means more possessions. Now they don't have those two things to fall back on.