Hello, I use Jaikoz. But one thing Jaikoz cannot do for me is delete duplicates of my whole library (130,000 songs) in one step. I do not want to reorganize my library into artists folders so I was thinking if Songkong would do that.
Does SongKong delete dupe based on Musicbrainz IDs?
Yes it does 
See http://jthink.net/songkong/help/help.html#d5e463
(I’m well aware of the Jaikoz memory issue, and some of the work done on a SongKong is a precursor to fixing that on Jaikoz but it will take some time.)