Obi-Wan's better than Qui-Gon in most areas and he's very familiar with Qui-Gon's fighting technique. There's no way Qui-Gon will penetrate Kenobi's Soresu. Gnost is quite good but in the end I don't think he's enough to give his team a majority. A few rounds, perhaps, but Obi-Wan remains the victor for a majority of fights. Far from comfortable, though.