Notice how Master made sure to close the door before fighting them trashes, coz they can't bypass a door that isn't opened by a human (or, simply said, they can't invite themselves).
@chillmare did he? i thought trash founder(dru etc) make that group after allen drop goma (after chap 41.3). anyway my original comment intended to be a joke not a fact check, sorry not a native speaker.
@kimikuman12 well sure dru changed name of grup but dru basicly took over from allen not nativ myself i was joking myself to ur joke so it was my joke that was bad lol
edit peace :3