Any trained person will have a advantage against a untrained
This is still a dumbfounded rhetorical and unstable discussion
Firstly..you are using 'dumbfounded' in a strange way.
Second, no, the type of training, the person, lots of complex factors determines whether what you are saying is true or not, plenty of trained people lose to untrained attackers, it most definitely happens. It even happens to people who are 'professionally' trained sometimes..i.e. security, LEO etc.
The only one who seems not to get the discussion is you, training against acts of violence, and training against your own martial art only are two different things, and it seems that is what is being asked about.