"Mike Jefferson" works because that's the bio name, then the "Michael Jefferson Jr." card just has Mike's PID linked. If the card's Name had "budler" with Mike's PID, it would have the same behavior.
If we add "Michael Jefferson Jr." as an alias to Mike's profile, you'll see it in search results AND any future cards would link "Michael Jeffson Jr." with this PID.
Also the stuff after the PID in the link doesn't affect anything. The following link will also go to Jefferson's bio page:
https://www.tcdb.com/Person.cfm/pid/138411/EdIsAwesome
* Ed * L8 * Cards in my personal Collection are unavailable *