The utterances of the Fed Chair, especially during the Greenspan era, are probably more finely parsed than those of any other human being on the planet. While deliberate opacity has its purpose, there's no reason for Greenspan to have allowed his views on tax policy to remain unclear especially once some of those views were widely trumpeted in the media. He has a big microphone. If his views were misrepresented, he could have easily corrected them.
The point is that as with many things the choice was never between the "Greenspan Pony plan" and the "Bush plan." The choice was between "the Bush plan" and "not the Bush Plan." The fact that the Bush plan was not equal to the "Greenspan Pony plan" does not mean that Greenspan opposed the Bush plan. He didn't. He supported it and gave it credibility, even if he murmured some slight concern about it.
