Mr. Justice Scalia's texts are not part of the Heller opinion. The Heller opinion stands on its own.
 The Heller opinion is not exclusively Mr. Justice Scalia's. It is his together with the four other Justices who joined in it.
You never did say which of the four justices will make up for the loss of Scalia's vote (assuming any of the concealed carry cases are even granted Cert). Not to mention Justice Thomas who will certainly side with Scalia on this issue.