Most good practioners of bjj will tell you straight up is that going to the ground in a street fight is not a great idea. There are some standup techniques in bjj but you are better mixing in some other system to help the standup. I wouild prefer to use a standup style combining MT and some S.P.E.A.R. techniques. Your silat would certainly be helpfull here. The value of the training is fairly simple. First of all bjj (and other similiar systems) utilized full speed full resistance training which is invaluable experience in fighting as you learn balance speed agreessiveness yada yada yada. Secondly if you go to the ground you obviously are better prepared than most. Finally in ground fighting the maxim to remember is : position and then submission. In other words if I was fighting on the ground my aim would be to take position (and I would use eye gouges, hooks bites etc to help me here. Once I had position I would then go to strikes such as elbows, headbutts etc etc before I would go for an armbar or choke etc. If he gave a quick arm to lock (and break) fine then I would break and continue pounding him. Another good maxim is :Grappling trauma may be your thing, but blunt trauma is king! And I say this as someone who really likes bjj.