Never said it was the only method with 2 squires, but its one of the most fail proof methods, if the sole squire does get marked there is always the risk he will replenish her hp. As for a starting party just trying out their first d3 run, around 33, they're unlikely to want firelord, and the setup with bishops and 1 or 2 squires is once again the most fail proof setup. Magicians are just a bonus if they are around, not a necessity. Squires and Bishops are a must, the rest are optional is my point...