Marie Severin stated in a 1986 interview that Krigstein colored this story: http://www.tcj.com/an-interview-with-marie-severin/
This story was originally a 6-page one, but Krigstein felt that length was inadequate and wanted to expand it to 12 pages. Bill Gaines said no to that, but he eventually agreed (with Feldstein) on 8 pages. Krigstein was paid $43 per page for this story.