Veteran first baseman Adrian Gonzalez will not be on the Dodgers' NL Division Series postseason roster because of back tightness - an injury that has plagued him all season - and is expected to miss the postseason. ''I don't think it's something you can go into a postseason with tightness and question marks up in the air, with healthy guys in there,'' Gonzalez said Wednesday. Dodgers manager Dave Roberts said he and Gonzalez came to the decision mutually.