Just recently picked the game this year and doing the Cargo evolution moment against the Diamondbacks. Mad Bumm was never even on the Dbacks in 2010, so why am I facing him? Maybe for future moments at least put in the right type of pitcher. Even on the Rockies 2010 schedule it was against righties. Guess he was just added in to make the moment that much harder with lefty on lefty.
They are all just vs the current team.
None of the Dbacks starting 5 from 2010 are in the majors anymore, they can't just put in anyone they want to.
Edit, I guess Ian Kennedy is, still, it's not that big a deal, at least imo.