We mustn't forget Jeff Horn. Ranked WBO#7 and 13th in another alphabet, he's ranked close to Parker in his division. Mayweather has retired, Pacman is about to, so it's really a good division. I'd love for him to have one or two more quality fights, and then fight Amir Khan:
Welterweight (147 lbs)
WBA--13. Jeff Horn
IBF--12. Jeff Horn
WBO--Timothy Bradley Champion
1. Sadam Ali
2. Manny Pacquiao
3. Brandon Rios
4. Amir Khan
5. Jesse Vargas
6. Chris Algieri
7. Jeff Horn
8. Ray Robinson
9. Bradley Skeete
10. Shawn Porter
11. Dmitry Mikhaylenko
12. Fariz Mammadov
13. Errol Spence, Jr.
14. Konstantin Ponomarev
15. Cristian Nestor Romero
Welterweight (147 lbs)
WBA--13. Jeff Horn
IBF--12. Jeff Horn
WBO--Timothy Bradley Champion
1. Sadam Ali
2. Manny Pacquiao
3. Brandon Rios
4. Amir Khan
5. Jesse Vargas
6. Chris Algieri
7. Jeff Horn
8. Ray Robinson
9. Bradley Skeete
10. Shawn Porter
11. Dmitry Mikhaylenko
12. Fariz Mammadov
13. Errol Spence, Jr.
14. Konstantin Ponomarev
15. Cristian Nestor Romero