There are many ways for the person to redirect himself/herself from trauma like the use of drugs and the use of alcohol.
The person will just be addicted in to gambling if he will use gambling as a way to redirect himself from trauma. We know that continuous gambling can result into getting addicted into it so if he will not gamble while in a trauma, he will not get addicted into it and vice versa.
I do agree with your statement. The manifestation is purely relative and depends upon the person on where they would displace their trauma. Some people do drugs, become alcoholics, get addicted to something, or even do recreational activities. It really depends upon the person on how he/she will react to the situation and if gambling seems to be their scapegoat, then that would explain some of the causes of gambling addiction.
Again, it is purely relative and depends upon the person's displacement of trauma.
Depends on the situation, if you get too addicted in gambling I think there is no big trauma aside from losing big money because when you get addict you still keep playing even if you don't have money anymore. The trauma may start from the people around you, there might be a change when it comes to relationship with your family, addiction can effect everything.
The trauma would be based on past experiences on winning/losing. The problem with gambling is that if you do not stop, you will only succumb to addiction in the long-run. You may feel that you are actually winning on some days but in reality, you just recovered the losses that you incurred from your streaks. Gambling can never be profitable in the long-run.