Well.... The way that PAD has explained it is that Fallen Angel actually took place slightly aside from teh main DCU which why no DCU proper characters turned up. However he deliberately wrote it so that Lee (Fallen Angel) could be read to be Linda (Supergirl). In one of the issues there's a character who is also clearly Batman in one of his aliases, although that's never stated explicitaly. However with the cancellation of the DCU series and the new (currently mini) series from... whichever company it is (I forget) it's now been stated that Lee was never Linda and that she'll get a completely new origin in the new mini-series.
So, basically, if you're reading the DCU Fallen Angel series then you can read the character as being Linda from PAD's Supergirl series but if you're reading the new series when it comes out then it's definately not Linda. Make sense?
