The determination of whether the novel 'Dio' is canon can be complex. It might involve factors like consistency with established lore, authorial intent, and the response from the fan community. Without specific details, it's hard to give a definite answer.
I'm not sure exactly who Jonathan Wamback is without watching the story. He could be an ordinary person with an extraordinary story, or someone well - known in a specific community or field.
The key events in Vasco da Gama's story begin with his commission by the Portuguese king to find a sea route to India. His voyage across the Cape of Good Hope was a significant milestone. Once in India, his establishment of trade relations was crucial. He had to deal with local politics and competition from other trading powers. His later voyages also had an impact on the power dynamics in the region, as Portugal started to assert more control over the spice trade routes.
Well, his review could also touch on the thematic elements of the novels. He may discuss how the author has explored important themes such as love, loss, or social justice. If a novel has a unique take on a common theme, Santlofer would likely point that out. Additionally, he might consider the overall impact of the novel on the reader, whether it makes them think, feel, or both.