I love this strip.
This strip is pure character development. Beef and Biz are interacting in front of a blank background. It's just the two of them. There are lots of ways both of them can go from this point. Given that Beef is a (the?) main character, a twin brother can only help to create interesting plot developments.
Evil Twins? That's getting awfully close to cliche country. Careful, O.
I hope Biz develops into a complex character like Ray. We don't need another cardboard cutout asshole like Pat. Two-dimensional characters suck.
He's already getting dimensions. Look at how dejected he looks when asked if those are the only two countries he knows. I think he's just a dude who wants to connect with his brother and is having a hard time.