Jehovah’s Witness believe that a “little flock” of precisely 144,000 will go to heaven to be with Jehovah and his “archangel” Jesus (not his son). The rest can go eff themselves apparently, though there is something in there about a post-millennial cleansing of some other miscreants who did not make the first cut. I reckon DLH’s “mission” here, with its “phases,” is to demonstrate to wrathful Jehovah that he deserves to be in the select “little flock.”
I know they get this from Revelation, the Bible's acid trip. I don't know enough about the JW theology to know if they think that 144,000 is the absolute cap on Heaven's residency permits. (Partly because if Watchtower is any clue, their official writings seem to come from robots. Partly because once you know about their deadly fixation on blood transfusions, you can see absolute evil flowing from faith. In my case, I don't want to read a lot about their delusions.) Revelation 7 doesn't
appear to say that no one will be allowed in, after 144,000 -- it just quotes John as having a vision of seeing this crowd. (If he sees them, then apparently he's not one of them. Make any sense??)
Wikipedia says there are over 118,000 JW congregations, and 8.8 million members. Doesn't that mean that, if you started with an uninhabited heaven, that 59 out of 60 of 'em wouldn't make the cut? But really, none would, because the church has been around for 150 years, so they'd have reached capacity over a century ago.