Pence opens up more VP possibilities for Hillary. Trump has problems with women and Latinos. Pence adds nothing there, but he does shore up Trump support among wary evangelicals (who were never going to vote for HRC, Johnson, or Stein).
Pence potentially helps in IN, MO, IA, PA, OH, and NC. Tom Vilsack would cancel out Pence everywhere in the Midwest except IN. Pence is a liability among moderates and centrist independents. Sadly Johnson isn't going to win any states, but hurts Hillary more than Trump among disaffected moderates. Johnson's liability is defense, so Stavridis could move moderates from Johnson to her. Would cost her some Bernie bros, but Stein votes aren't going to cost HRC any blue or purple states. Bob Gates would be an even more aggressive pick, but Hillary's too risk averse to go that far.
Trump makes Castro and Perez unnecessary. Same thing with Pence and Warren. Brown would be unnecessary panic response to Pence. Leave Kaine in the Senate and give Vilsack, Stravidis, and Hickenlooper long looks. Boring OWG picks, but Hillary doesn't need high risk/high reward to beat Trump/Pence. Franken would be a compromise pick, but Vilsack shores up the Midwest. Franken/Pence would be a VP debate beat down. Pence can't think on his feet to save his life.