Most likely Jerry Brown I mean being a governeor of California would give Brown a chance I think.
No way in hell. The convention delegates were already selected and they were Clinton delegates and not particular fans of Brown. Moroever, you can't kill the whole Clinton staff and those who remained working on the campaign would have exerted maximum effort to see that Brown (who was despised within the Clinton camp) would not be the nominee.
Nor would it have been any of the other defeated candidates, none of whom particularly distinguished themselves as strong candidates.
You would likely wind up with someone who had run before and been vetted by the press -- no Eagleton-like mess could be tolerated. There were a few staffers who had ties to Dick Gephardt, who meets the criteria above (though tainted a bit by the then-recent House bank scandal, IIRC), so that's a possibility. There's also the potential for a complete free for all on the convention floor and I'd expect some sort of draft Cuomo movement to arise from certain quarters. More likely than not, you'd have an actual honest to God brokered convention.
In all honesty, though, I don't know how it would have turned out. And I spent June of 1992 working in New York for Clinton on setting up the convention...