re a menuval being used for a yeshu’a
have a look in rambam hakdama le mishnayot where he writes that God will help a rasha to build a huge palace in order that a tsadiq will years later be able to rest in its shade
and finishes the rambam , that is the pshat in the pasuk ‘yachin rasha ,ve tsadiq yilbash’.
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so according to rambam it is possible that a tsadiq would benefit from the menuval ,
and moreover , said menuval receives his siyata dishmaya in the merit of the tsadiq
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