Fitts might have been a 50 FV a while ago. But he certainly isn't now. He'll be 26 in 3 weeks and he's been trending down for 2 straight seasons.The Cards got Clarke and Fitts, both FV 50 pitchers according to FG. In exchange the Sox got Gray for $21M (Cards sent $20M in cash). The Braves don't even have an equivalent package, since the only 50 they have is Fuentes (though one could argue Fuentes plus Cam is just as strong).
I think the Cards did pretty well here, and is exactly how rebuilding teams should use cash to extract better prospects from the other team.
But I would agree that the Cards made out well overall.