I read the quote as saying we don't need a great or even good backup PG to compete.
He just pointed out we can even win with Tony playing to spot, which I think you'll agree is remarkable.
Agree. He just elaborated on what he was saying about Rondo earlier this year - he doesn't believe you need a point guard, much less a backup point guard, to win in the NBA. He cited the Lakers of this decade, 90s Bulls and 80s Celtics as examples of dynasties that had no point guard.
I tend to agree - I'd still rather have another solid defender at the 3 than another point guard. Keep this in mind - only two of the other four contenders have a real point guard - Spurs and Magic. Cleveland has a small 2 playing as a 1, Lakers have Fisher, who might be a point guard but isn't a playmaker, just a guy who brings the ball up the court and takes open shots when the ball comes to him. They all, however, have bigtime perimeter players (Kobe/Artest, Ginobli/Jefferson, Lewis/Carter, Lebron) and post presences (Pau/Odom, Duncan, Howard, Shaq/Z). If we need anything, it's to shore up the perimeter rather than the point.