i say minato. if he does tht sucking soul thing he cud just teleport away. he is a master evader. plus he can redirect objects as large as a tailed beast bomb from a full powered 9tails.plus he cud easily evade chibaku tensei cuz he always marks everywhere he goes its a hobby. here is wat i think will happen. nagato sends summons(he always does this first) minato redirects them towards nagato. while nagato undos the summon jutsu minato already threw the kunai and is behind him ramming him with a rasengan ending the fight. it is not hard for minato 2 do he is a genius if u cant except it big whoop.