you said yourself, he UTILIZES others, not as much as he WORKS with them, don't get me wrong, they are his partners, he cares about them, and half the time he works WITH them, but the other half he just keeps the others away, maybe he is trying to protect them i remember a story where clark and bruce are discussing a case involving bizarro and tim is ear-dropping, bruce notices and sends him away, and then tells clark that when superhuman beings are involved tim is forbidden to participate.
i'm not saying bruce doesn't care about the bat-family, but he'll never allow himself to really get to close to them, he's been hurt too many times and now knows better than that