Not so. When CJ croaks, senate will have to choose a new CJ. Roberts had two votes. One to become AJ, a seaparate vote shortly after to take CJ slot.
No, he didn’t have 2 separate votes. They are entirely separate positions.
You may be confused because he was first nominated to replace O’CONNOR, who retired. When Renquist died that nomination was withdrawn and he was renominated to replace Renquist.