The Grizzlies aren't really physical at the guard positions, and even Tony Allen isn't that physical. He is just a great fundamental defender. He also studies opponents' tendencies. They are physical down low.
But last night, the Warriors were getting the benefit of touch fouls, and the Grizzlies weren't getting the same calls. And I will never understand how the NBA chooses when to call traveling. Klay Thompson traveled at least twice late in that game. It was typical NBA trying to get a one seed back in the game, and the Grizzlies just made plays.