I don't think he willr returning the middle of the show. I also don't think Taker and HHH will be in the middle. To me Brock could play a role in that scenario.
In other Batista news, he was in Miami spotted with Titus ONeil according to reports. He has the tie in to Rock and Cena unlike Brock, as he was Rocks last WM opponent and Cena was his.
Im not sure if one or both will even be on mania but the thought of adding bothof them back to the roster is great because they are just what the wee needs to re-establish the brand split. You could place one of them on either brand assuming they are at least tv regulars like HbK and Taker years ago. You could also simply place both on Raw and then load SD with the injured talent in Wade, Christian, Cara, and Del Rio (would say Rey but Raw needs the Hispanic draw boost)