dodge chance is also base on the current defense and resistance that ninja has, in addition to the base chance (50% for minato and 60% for tobirama). the more defense you have, the more you dodge and vise versa, the more defense the opponent has, the less you dodge

for example edo minato at pos 1 and edo tobirama at pos 2, which means minato will probably have a lot more def and res than tobirama. so the chance of him dodging standard attacks is way more than tobirama's

same mechanic for suigetsu's and madara's dodge

so like... a p2-p4 hitting minato compare to a p1 hitting tobirama, minato will have a lot more higher chance to dodge