Also, if Pocket did reject the book, and still would reject acquiring any rights to it; then I think the question comes up whether or not printing it through a small publishing outfit (with all its imperfections) would be better than trashing the whole project in light of Pocket's rejection. Perhaps Cushman was faced with that scenario. I'd prefer to see these works published - hopefully with fewer errors in the subsequent editions.
Publishing through a small publisher or even no
publisher is no excuse for numerous factual errors and poorly sourced assertions. It seems to me these are the real problems with the book, and they have little to nothing to do with who the publisher is (other than the fact that a publisher could refuse to publish the book until the problems had been taken care of).