Completely consistent. The Bush/Gore case had to go to the federal system as the decision directly affected a national political race. However, the Schiavo case would not, at least according to the author of the Constitution, be a national issue. It was clearly within the confines of the state's powers, and should have remained within the state court system. For the record, Greer also did not create new law but upheld previous precedent, in effect following the existing rule of law.
No, the fact of the matter is, Greer broke many laws. But for some, the end justifies the means, so that's okay. As long as it paves the way for whatever it is you're planning, no problem!