Right now he can help with strategic planning and limited support, but when they got to neighborhood and really had to go all out,

Hyuse will have better general knowledge of enemies, with OP magnetic nanorobotkinda weapon

Yuma will have more authentic battle strategy from experience, with a versatile powerful black trigger that could literally be anything

Chika could friggin blast anything to oblivion, seeing neighbor troops usually consist of more trion soldier than humans

And Osamu will... Setup wire in an unknown environment? I'm not even sure if they could get access to enough landscape information to set wires up in actual expedition

Hope he don't get morally depressed when he realized in the middle of expedition that his role up until now is almost too specialized in fighting human-to-human combat with no killing intention