I’m glad you detailed that testing against another vaccine is explicitly only useful for efficacy, and not safety. And also that saline is clearly the cheaper, easier and more obvious solution.

I want you to remember that when you see the list of licensing trials.

Some things in life don’t turn up the correct answer from a Google search, or “politifact” just turns out to be regurgitating the prevailing opinion. But when you really do the work you end up finding out something that you’d rather not be true.