Other M could be called Fridge Logic: The Game. F'rinstance consider things from Adam's perspective

    Metroids were officially destroyed according to who's report
    He opposes bio-weapons research but Samus broke protocol (an explicit extermination order) to turn over a living sample of a creature deemed too dangerous to exist to outpost science station
    He knows there is a faction in the GF out there trying to run around his recommendation and the standing "no bioweapons" ruling. So much so his XO and him are trying desperately to gather evidence
    Samus left to effectively become a one woman Blackwater after sympathetic but still less than stellar behavior and likely chasing a crusade to "rid the universe of suffering" or something akin to that or save everyone.
    Uhoh on a rush mission to uncover an illegal research conspiracy guess who just shows up and oh yeah could be the only source/expert for all this

In short played from Adam's side Samus's presence and overall participation and involvement is suspicious and possibly dangerous. Moreso when factoring in rumors of possible assasin in his own ranks (that he observes over her comms but her presence like that could be...well a performance) This more than anything may help ease you into understanding his often overly stiff and reactionary attitude though his trust and belief in her comes through in the end Samus, from his view, was looking suspicious as he could be from our own