Baseball Braincruncher, Who am I?

[Journeyman]

I played in Seattle quite a few years ago

 

[TheGeneral+]

Ken Griffey Jr and BTW, he is a bit Over weight I seen.

 

[Journeyman]

My first name is the same as a very well known U.S. city

 

[Journeyman]

#3. Not only was I a baseball pitcher I was a Pilot.

 

[Fishhead]

DIEGO SEGUI

 

[Fishhead]

My good friend Mike Ferraro from Vegas played for the Pilots.

 

[Journeyman]

My final two clues;

My son plays today...

I was the only member of two Seattle franchises....

Kinda tricky with the Pilot reference, was hoping your or Wil would be stumped,lol