Hi pnixon,
Have these 5 'Brian Adams' same mailbox?
Even if they have same name, but the mailbox of them might be different.

In addition, there is a behavior that is not very obvious:
when we double click the fullname area of a contact, it will navigate us to target contact record.

A pop up will ask us whether to leave current page:

After click "Ok", we will open the entity form of the clicked contact.
Due to each record has a unique GUID(it can be found in address bar parameters), thus we could distinct contacts who have same full name.
Regards,
Clofly