Minato takes this. A lot of people seem to forget that he has a contract with the frogs and any of those frogs will turn the tide of battle for him. He can just summon ma and pa and the can sense invisible enemies
EDIT: Plus he him self is an excellent sensor. He can sense any mark he puts around and can sense things when he puts his finger on the ground
we dont know if he can summon ma and pa,we have seen him summon bunta,juraiya used ma and pa for sm purposes,naruto never summoned them,also the clam's mist affects sensors apparently as none of the sensors aside from gaara could find the clam,and it took a short while to find it,also destroying that clam isnt a walk in the park,and the mizukage will be attacking him and his frog summon as they try to find the clam,muu is also an excellent sensor as well,and had troubles with the mizukage's techs