Do I have to use my last alignment star for the All-Star polar alignment...

No. Nor do you have to know its name.Find a bright star close to the meridian. Choose one at or below the celestial equator in the south (for mid-northern latitude...

Do I have to use my last alignment star for the All-Star polar alignment...

No. Nor do you have to know its name.Find a bright star close to the meridian. Choose one at or below the celestial equator in the south (for mid-northern latitude...