Maybe the WT does have it wrong about who the term great crowd is being referred to in this scripture. But the Bible still gives a number of how many it is that goes to heaven. Does it make JW evil if they have it wrong?
New International Version
and they can no longer die; for they are like the angels. They are God's children, since they are children of the resurrection.
The scripture you pointed out reads they are like angles because the resurrected are now undieing. If they go to heaven why doesn't it just say they are now angels?