Sure. It depends on what definition we're using for "gifted". Practice may not make you into von Neumann, but it may very well make you into a professional math

Sure. It depends on what definition we're using for "gifted". Practice may not make you into von Neumann, but it may very well make you into a professional mathematician with stable employment. My intuition is that if someone is interested enough in a career in mathematics that they begin putting regular practice into it, then they're already likely (but not certainly) past the minimum IQ threshold.