John Rous, the medieval historian who died in 1492, claimed that after Richard's son and wife had died a year apart, he'd named Edward Warwick as his heir with Edward's cousin John de la Pole, 1st Earl of Lincoln named as 2nd in line. There has been no proof found that it actually occurred though. Edward was created the 17th Earl of Warwick in 1478 after the attainder, and execution of his father. Richard, Duke of Gloucester had no problem declaring the sons of Edward IV as illegitimate, and usurping the crown for himself. If he had really wanted to see his nephew Edward on the throne instead of himself, I have no doubt he would have been able to get it accomplished.
I am reading a book about Catherine of Aragon, first wife of Henry VIII. It does tell about the death of Warwick so that her father Ferdinand (and Isabella), would consent to the marriage since the inheritance would not be contested. Catherine found out that her marriage was started with a murder and years later bestowed kindnesses on that family in recompense. In the Ferdinand and Isabella marriage, she was actually the stronger and smarter ruler, even leading troups into battle against the Moores.
In a separate line, the book also described riots in London because foreigners with skills had successful businesses and were putting native English out of work. Riots occurred and people were executed. A little like the Brexit fuss, where one of the issues is Polish plumbers coming to England and doing better work than the native English.