Season 5 winner: how could they?

how do you make someone a master chef when, every single service challenge that they were in, they failed. they were the worst in the kitchen even if they weren't on the losing team. one time they were crying so bad, tears and snot were dripping into raw fish that was served. not only that, the chefs that owned the places they worked in said they would never have them in their kitchen. yet, that person makes it as the master chef of Australia. curiouser and curiouser