So true @PrasadVR and as you have cited, it seems that of late, this has been a hot topic of discussion here on Connect.
I’ve often said that the Leaderboards are much more than just about rankings of Local Guides. Yes the rankings is the fun and friendly competitive side but the real power is, as you have hinted, the tools and extensions built into the System behind the Leaderboards. I’m pleased to see you explore and use these features. The Stats Summary and the Hidden Photos extensions certainly give you a good kick start on this issue. Is there more that we can do (e.g. pinpointing the hiddens)? Yes but how far do we go and who’s got the time and know-how?
I’ve said this before, my view is that this the best approach and once done routinely monitor things (preferably monthly) before they get out of hand.