I did further genealogical research on the true heir to England and Scotland, and discovered that it is not likely true that the 2nd wife of Bryan Fitz Alan, Maud was the daughter of King John of Scotland. Therefore the heirs to the House of Balliol would go to the descendants eldest of John's sisters though I am having trouble finding which one of them is the eldest because there are contradictory genealogical charts. If Ada was the eldest, then Prince Pedro of the House of Bourbon Two Sicilies, an heir I previously mentioned, is the rightful heir.
I was also recently visited by my parallel self from a parallel universe and a wizard merged us into one causing me to have memories from the parallel universe. In the parallel universe, John's son Edward Balliol had descendants who gained their rightful crown so to promote the legitimacy cause in this universe, I am going to write and publish a book about what happened in that universe.
In case I become famous, I don't want people to discover the post I made about my second cousin's immoral behavior, because her side of the family would be PISSED if they saw that. It is unfortunately quoted on FSTDT so I will have to write under a pseudonym but as an extra precaution, I will eventually delete that post from this site.