Yes you can use the Adrian Gonzalez card and any other card earned on the rewards for conquest. Just make sure you take AL/NL into consideration when doing those specific missions.
AL pitching use...
Guidry, Davis, Ziegler, and Benoit
NL pitching use...
Estrada or Alvarez
AL batting use...
Brett, Edmonds, Martinez, Baines, Green
NL batting use...
Murphy, Desmond, Gonzalez, Karros, Crawford, Kemp, and Pit 2B (can’t remember name)
For the MLB missions after you can use all of the above as well as Cole Hamels and Edgar Martinez
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