In the condor universe, there are three novels : LOCH, ROCH, and HSDS. We all know that LOCH flow nicely into ROCH, but there is a large gap of time in HSDS and ROCH. That large gap of time encompass the life and growth of ZSF. I felt there should be a novel on the story of ZSF. It would be interesting to learn of his struggle to become such a great martial art master and we can also get more information about Gwok Jing and Yeung Gor post-ROCH. Too bad it was not written.
If it had been written as a part of the Condor Series. All 4 novel would seemingly tell one long story of four heroes. First hero being Guo Jing, who crosses into the next story of Yang Guo, which both will cross over to the story of ZSF and then we end the Condor series with ZWJ.
Since Jin Yong is still alive, I hope he would write this missing Condor novel.