Mike may have been the last killed but it's not like they could have recovered the bodies of the other guys before they got Mike's. At least not recovered them, then returned then had a funeral then set out in search of Mike.
It's not a big deal, I just wish they would have mentioned the other guys so it didn't feel like the writers are treating everyone else as cannon fodder.
There were five or six graves, so they recovered the two scouts and probably the Mass7 guys they killed.