I don't know Castonzo but seeing BC guys celebrate their Draft always makes me smile. Here's this big kid/young man wiping tears and high fiving his friends and family. It's a really special moment.
As for his potential...I think Indy is a perfect fit. He'll play in a zone and pass heavy scheme. You have to pay attention to Manning, but Castonzo has the experience and smarts to keep up.
I am indifferent to the Colts, but will be rooting for AC to succeed!