Thanks all!
Here's a pic I just took with my phone of the little stinker, sound asleep after a day at the dog park with his two "sisters". The girls have been great with him so far, really showing him the ropes. He seemed hesitant to be at the park, off-leash, and is verrrrrrrrry submissive with other strange dogs (which I had expected because of how he acts with Bailey & Blaze) but I was very proud of him. Came when I called, and stuck with us.