Read the DoJ briefs in the Gratz and Grutter affirmative action cases. Also, note the fact that Gonzales DIDN'T submit a brief supporting the property owners in Kelo, but he DID submit a brief in another property rights case (Lingle v Chevron), arguing in favor of allowing local governments to engage in rent control. That's a liberal Republican for you.
First of all, Gonzales did not write the briefs in the affirmative action cases, and in fact wasn't even working for the DOJ at the time. I will agree that, as WH Counsel, he apparently overruled the initial DOJ position that affirmative action is per se unconstitutional, but it's a long stretch to claim from that he's a liberal, and that position was a losing position anyway. If you were going to file that brief, then you might as well not file any brief at all.
I'm more concerned about the abortion issue. But I don't agree with your conclusion that because he voted against the parental rights case in Texas, that means he would vote to uphold Roe. He was just following US Supreme Court precedent, which he is bound to do. I am not saying that he would vote to throw out Roe, but I have confidence that Bush would not appoint him unless he was certain that he would.
As far as the property rights case is concerned, I don't see how you can conclude that his failure to file a friend of the court brief in a case that was briefed long before he became AG proves anything. And I doubt very much that he had anything to do with the brief in the Lingle v Chevron case. He just became AG in February, and the case was argued less than 3 weeks after he became AG. The briefs are generally filed months, even in some cases years before the argument.