Finn was the one who convinced Gunn to hire Chris Pratt, and apparently Pratt had to be convinced to audition for the role as well.The way it usually works is a director/producer will give a casting director their top 5 or whatever dream picks for a few roles, and the CD will go off to negotiate deals to make it happen. They'll go back and forth between the director/producer and the actor's agent (unless the director/producer are personally friends with the actor aka Favreau/RDJ, in which case they'll have a more proactive role in proceedings). So it's doubtful Sarah Finn actually decided all these major MCU roles at all, she was likely given character descriptions and free reign for minor characters like Ant-Man's Luis and his gang, etc.
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Sounds like she moved mountains to make that meeting happen and Gunn was immediately convinced that she was right.