Okay. I just read the profiles of the various candidates, including Unknown, Greenleaf, Warren and Markham. It seems like the controversy is: Who did the widow of Robert Greenleaf marry? Thomas Warren or Thomas Markham?
At the moment, the sources supporting Thomas Warren *appear* to be more solid than the sources supporting Thomas Markham but there is a "rant" that implies an error was made somewhere. Unfortunately, the rant does an insufficient job of citing its own sources; while it encourages us to review original records, not published ones, the rant does not cite those original records. But the profile making the case for Warren DOES.
So... as things stand, the case for Susannah Unknown, widow of Robert Greenleaf, marrying Thomas Warren appears stronger.
If the proponents of the Markham connection want to make their case, they've got some work to do, finding and citing the original records they want us to review.
And nowhere did I see evidence supporting a maiden name of Greenleaf for Susannah, no matter which Thomas she married. One of the supposed duplicates offers a set of parents but the sources used are those horrid ancestry.com creations.
If I missed something, my apologies.