Well, I must state first that it was not me that caught the following but rather my wife. While considering the following chapters of Revelation we noticed the following:
AV Re 5:5 And one of the elders saith unto me, weep not: behold, the Lion of the tribe of Juda, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof. [...]
6. And I beheld, and look, in the midst of the throne and the four beasts, and in the midst of the elders, stood a Lamb, as it had been slain [...
]
9. And they sang a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us for God by thy blood out of every kindred, and tongue, and people, and nation.
In these verses above we first read how the resurrected son of God is described in both Jewish and Christian terms, that is, as the Lion of the tribe of Juda and then as the Lamb. Not only that, but when Jesus is described as the Lion of the tribe of Juda John is told about it, whereas he actually does visualize the Lamb standing. Finally, the 24 elders sang and declare that he redeemed them out of every nation, people, etc.
Now, let's read Revelation 7:
AV Re 7:4 And I heard the number of them which were sealed: [and there were] sealed an hundred [and] forty [and] four thousand of all the tribes of the children of Israel. Re 7:5 Of the tribe of Juda [were] sealed twelve thousand. Of the tribe of Reuben [were] sealed twelve thousand. Of the tribe of Gad [were] sealed twelve thousand. Of the tribe of [...] Re 7:9 After this I beheld, and, look, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and [...]
Immediately after these verses describing the sealed ones he uses the same expression or transition he used in chapter 5: "And I beheld, and look,".
Just as the vision of him hearing about the Lion of the tribe of Juda and then seeing the Lamb was the same vision so the same must be said of the vision where he first hears about the number and origin of the sealed ones in Jewish terminology and then continues to say that now he beholds and looks at this same people but in non Jewish terms: as a great crowd that no man could number out of every nation, people, etc.
Finally, note that this crowd is also described to come from the same origin as that sung by the elders and creatures; out of every nation, people, etc. that is.
Thus, we see that in Chapter 5 John first hears about Jesus in Jewish terms, then uses a transition to continue the same vision where he can now behold Jesus in different light.
Same thing happens in Chapter 7. John first hears about the sealed ones in Jewish terms, then uses a transition to continue that same vision where he can now behold the sealed ones in a different light.
PS. I can understand how most of us feel about prophetic stuff, doctrine etc. But I must say that now that I am no longer capped by the evil slave I can grasp other people's reading comprehension without any bias; that is including my wife who is not or has ever been a jw.