" (but those know that Christ’s brothers are only jws who believe they will go to heaven?)"
I'm of the opinion that the definition of Christ's brothers is going to be narrowed down to refer only to the GB.
So this: “People will be dealt with on the basis how they have treated Christ’s brothers”, particularly this "...how they have treated Christ’s brothers” will mean "how obedient they were to GB dictums".
It's a hunch I've had since they've been pointing out Jesus' brothers in their articles. Them being called "future kings" by sycophants doesn't ease my suspicions.
Jesus may have returned invisibly, but his brothers, the GB (🤮), are fully visible, and are to be obeyed the way you would obey Jesus.
I'm still very interested in what's in the August Watchtower.