How long have you had him? I think with time he'll show who he is, the best thing you can do for now is work on that bond, and praise him for his focus! I found it takes almost 6 months for a dog to really be comfortable in their new environment when they've been thru some life altering experience. The inhibition is due to lack of confidence and probably trust in you....but the bonding you're doing right now is going to pay off!
I'd love to see photos of Rocky and Indy, too!