Perhaps because I have never been a fan of Margaret Beaufort, my suspicions have always centered around her. She could have had access to the Tower as well along with a so-called assassin.
It would be really helpful if the Queen would give permission for the bones discovered under a stairway in the Tower to be tested to see if they are the Princes and put this theory of living out their lives elsewhere into adulthood to rest once and for all.
According to the contemporary reports of where the bones in the WA Abbey urn were found, they most certainly can NOT be those of the sons of Edward IV. Those bones were found ten feet
under the stone foundations of a stone staircase outside of the White Tower that was built over
200 years before the boys were born. It took the 17th-century workmen several weeks to dismantle the staircase, and they thought so little of the bones that they were originally thrown on a garbage pile. Several weeks later, someone remembered the story of the boys, and the garbage pile was searched. This is most likely when the "velvet" and animal bones were added to the find.
It defies credulity to think that a hole large enough to be excavated ten feet UNDER a stone staircase could possibly be overlooked by the 300 people who lived in the Tower full-time, or the several hundreds who worked or visited there daily. Someone would have said something, especially after Henry Tudor gained the throne. "Oi, they dug a great big 'ole roight there they did - funny thing that, gov." If Henry could have produced the bodies of the boys (who would have probably still been somewhat recognizable, even after two years) he would have most certainly done so so he could officially blame Richard III. This did not happen. Henry never officially said a word about his brothers-in-law's fate; he let rumor and gossip do the job.
The bones in the urn are most likely those of Roman children, buried in the well-known Roman cemetery that exists under the Tower site.
I don't know what happened to Edward of Westminster or Richard of Shrewsbury, and as of now no one else does either. It's quite possible that neither Richard III nor Henry VII did either - Henry Buckingham was Constable of England at the time and in charge in London, and he could have had them moved on his own authority as Richard was away on his coronation tour when they "disappeared." Buckingham, of course, was executed after he rebelled against Richard that autumn; Richard never spoke to him again. Conversely, Richard may have moved them, separately, before he left and sent them to places known only to a few. We will most likely never know - but hey! They found Richard...