Powerlifting is overrated for martial arts. Try actually doing combat sports and you'll soon figure that out.
Obviously it helps getting stronger, but being stronger in the PLs doesn't really have major impact on how well you escape from under side control, how well you bridge, how well you shrimp, how well you kick, how well you get that underhook, how well you time that right hand and I could go on for ages. PL is about lifting something heavy in a pre determined range of motion and then sitting on your ass for 5 minutes before you do it again, it's completely different. I must admit, that it does seem to help in the clinch, with a sprawl(if you time it) and maybe a better squeeze.
It's a good tool, and I like PLing a lot, but it's vastly overrated. Technique work is more important, especially in the beginning. You get pretty strong grappling guys for hours each week. Most guys who lift a lot walk around thinking that they are badass fighters. Yes, it does help being big and strong if you want to defend yourself, but walk into a good MMA gym and you'll get a reality check real quick. After the initial burst, you're done.