So it's mostly just a scheduled list of contestants based on their qualifying date? I get the same name disqualification, but does production pick and chose contestants to face this guy? If they wanted to have a lengthy win streak for publicity purposes, they could let him face weaker opponents.
if you make it that far - you aren't weak. and s&p wouldn't let them take players who weren't qualified just to keep him on the show (nor would Jeopardy want that anyway).
has nothing to do with qualifying date either - once you get an in-person audition, you're in the pool for 18 months.
they select on a wide assortment of things, including gender, race, age, location, video of you playing the game, interview, and even something as silly as first name. There's a higher percentage of Los Angeles/SoCal Area players as they serve as back-ups each taping day in case someone gets sick, misses a flight etc. If you do a whole day as a back-up, you then are placed in the next set of tapings as a confirmed contestant.