Hi @Justin_Reynolds,
I am not the "architect" of our Banner to Canvas CSV extracts (that was done by a programmer in our IT Department) but at my institution our data transfers only include the user's (whether faculty, staff, or student) institutional email address as listed in Banner and not a personal email address (which also is in Banner).
From in Canvas, user's (regardless of their role) do have the ability to add their own additional email address(es) but they cannot remove their institutional email address.
This means that unless someone adds their own email address manually, we do not have any personal email addresses in Canvas (especially ones that are coming from Banner).
If a person goes through a name change, they would need to work with the institution (the exact steps vary depending on their role) to have it changed and that would (probably) change their email address. That new email address will be in Banner and would be included in the next data transfer to Canvas.
Does that help?
-Doug