He brought it on himself and he doesn't seem like a pleasant person. And the JSA had to make a point of puniching that behaviour to make it stop.
But still, I feel a little bad for him in the end... His entire life has been dedicated to sumo. It's all he has been doing growing up, to the point of even transforming his body into what is best for wrestling. He was good at it, and was, baring injury, almost guaranted a succesfull career with lots of money and status. Now its all gone, before it really started, and he probably has no idea what he is going to do instead. The money he got is I believe something like the equivalent of half a years normal salery (which he probably blew on his lawyers).
And meanwhile his twin brother will still have all that which he has just been denied. The greater his brothers succes the worse he will probably feel his own failure.