All the above is true,
I'm surprised you have not informed that this engine is a 270 and not a 180 (both pistons opposite) or a 360 (both pistons side by side).
There are many reasons why Kawi chose to go with the 270, but for starters it vibrates less,(rocking couple) and can have a smaller fly wheel and smaller balancer shaft, (both equating to less weight) than a 180 or 360 as only 1 piston is ever stationary at a time during a full 720 degree rotation, the other is always on the move.
The same 270 configuration engine is used by many motorcycle manufacturers, Triumph, Norton,Yamaha,Honda, and even KTM, to name a few, though KTM being KTM had to do things different and made their engine 289 which mimics exactly the KTM V Twin exhaust note.
There's nothing odd about this engine at all, it's just the same as any other 270 parallel twin.
As I've said before, the 270 crank angle is what gives this (and many other) bikes their distinctive exhaust note.