In the Ryder Cup, no captain judges their team’s performance by the first tee shot of the opening fourball. A birdie might raise expectations, but it guarantees nothing over the 18 holes ahead. The first round of the United Rugby Championship offered only the faintest sketch of what lies ahead for Ireland’s four provinces, even if the contrasts were striking. Munster, Ulster, and Connacht all had bonus-point wins, while Leinster found the bunker off the first tee and suffered an uncharacteristic performance that has upset their fans. Munster: Returning to their roots The most interesting narrative from last weekend belongs…