Re the Huntress backup
The DC History Club had Roy Thomas as a topic
“You took over Wonder Woman. Because you’re a guy, what was it like to come up with good stories for her?”
“No problem. I’d been reading WONDER WOMAN since I was at least five or six. But I talked things over, and to some extent co-plotted with, my girlfriend and soon wife Dann to get more of a female perspective. I’m happy with the short-run Gene Colan and I had on the magazine, but DC (without deliberately trying to) kind of double-crossed me in various ways and reduced my enthusiasm for doing the heroine, so I left.”
Turok here
When Roy entered into a three year contracts with DC Comics He was to write 100 pages a month.
The Huntress backup reduced the number of pages he could write each month for Wonder Woman as well as potentially reducing his income. He had to find other titles to compensate for that loss of income