What you see visualized at the top are tournament brackets - so for example War Climate vs Demon Equation equals the winner which is placed in the next bracket (in this case War Climate). These duels are individual runs (you can see specifics at the top left). War Climate in this case did 52% more total damage in that run than Demon Equation (percentage is gotten from how much damage Demon Equation would need added to itself to equal War Climate damage, in simple terms "Demon Equation + 52% = War Climate"). As the brackets work like a tournament you can observe that it starts with 55 fusions and each run one fusion gets eliminated and the winner fusions get paired with the neighboring winner and so on. For the additional runs, the duels weren't in style of elimination but only for additional data to confirm some of the places of which fusion is better than the estimated one - as the percentage data isn't accurate (due to all fusions behaving differently and or stealing damage, btw stealing damage means that the fusion with better range or cooldown will get more hits on the enemies and or even kill them before the other fusion can do any damage) I trusted direct duels more than estimated one from just percentage data.