What would happen if Richard of Gloucester (the future Richard III) fails to execute Anthony Woodville, Earl Rivers (the maternal uncle of the two Princes in the Tower, Edward V and Richard Duke of York). Let's pretend that Richard grants Woodville clemency (not so likely) or perhaps Rivers escapes while Prince Edward is still in Richard's custody.
What do you think will happen? Would Prince Edward succeed as Edward IV intended him to? Or at the very least Richard, Duke of York? Would England be plunged into civil war if Richard of Gloucester still insists that Edward IV and Elizabeth Woodville's children are bastards?
Or let's consider another scenario. Say Anthony Woodville lives, but the Princes still disappear and Elizabeth of York still becomes Edward IV's heir. If her most capable, well-known and respected (maternal) uncle is at her side and the Woodville faction is much strengthened, do you think she might become Queen Regnant or rule jointly with someone else (maybe Henry Tudor) similar to Ferdinand and Isabella?
Do you think England would be able to handle Edward IV's female heir ruling in some capacity? I personally don't think she was the doormat as some like to paint her. I'm of the opinion that she exercised any power or influence she had in a quiet diplomatic way and had a capacity to smooth things over which her immediate predecessors lacked. As Queen consort, she enjoyed unprecedented popularity (which is not the default for the majority of Queen of England upto this point - see her predecessors Elizabeth of York and Margaret of Anjou) and had more of a good dose of Edward IV's gracious, warm personality, so I could see her being much more capable than history gives her credit.
I hope you guys enjoy this scenario

I'm looking forward to your responses!