If they pick Castro to raise the money and shake the hands and look pretty, hopefully they hire an extremely smart, strategic person with integrity to be his lieutenant and do all of his thinking for him.
What evidence is there that Castro is dumb?
1) There's no evidence that he is
smart (strategically speaking - in terms of IQ, he's Ivy-educated, so he's at least somewhat above average generally speaking). The vast majority of DNC chairs have been colossal strategic morons, exceptions like Dean aside, who sacrifice the long-term goal of building the party starting from the ground up in state parties rather than pursuing narrow short-term national relief from campaign contributors.
2) I don't trust him. He seems like the type to not have a good ideological vision/cohesive message for the party nationally, and more likely to pursue the same kind of nebulous bullsh**t the democratic party usually relies on whilst sucking up to campaign contributors and doing their bidding.
The DNC chair only matters so much when there is a sitting President, TBF, so if Madame Hillary wins Castro will be her puppet. She's possibly better on dimension #1, pretty bad on dimension #2.