I have taken some pics.
The grain is uneven but the leather is not thinner on the more grainy areas. I believe some people call this grain rivulet grain, kind of like water flowing through rocky terrain. From my observations these couple of days i realized this grain plays a lot with the light so it is bit deceptive. In broad daylight inspection the grain seems more uniform than with dim interior lighting.
I have attached a website picture from an A2 horsehide from eastman and it seems to have the same uneven grain in the front and back panels while on the sleeves it is much less grainy. Probably it is the look elmc eastman is trying to go for because on mine it also is more grainy on the front and back panels while on the sleeves it is much less grainy.