Perhaps A Believer, no one can say dogmatically the Great Crowd is this group or the other because the bible is not clear regarding that matter. I would argue tho that there is more evidence pointing to them being in heaven, "before the throne", rather than them being on Earth like WT teaches.
Another WT doctrine I found to be inccorect: It teaches there are two types of resurrection. One spiritual for the 144k and the other much larger physical resurrection on Earth. What does the Bible really teach regarding this matter? I invite you to read 1 Cor 15th, the entire chapter, then you tell me how the Bible describes the resurrection.