You went back a whole chapter. That is neither the 144000 or the great crowd of the tribulation.
The Bible uses the term "great crowd" twenty-four times, referring to different "crowds" or "multitudes". It is silly to pretend that every crowd in the Bible is the same as every other crowd in the Bible. Mentioning that Revelation 19:1 mentions a great crowd in heaven is no more significant than Matthew 26:47 mentioning a great crowd with swords and clubs.
Of course, Jehovah's Witnesses have always recognized that the term "great crowd" is used uniquely at Revelation 7:9 in that there that particular "great crowd" describes the group of humans who survive the "great tribulation" to live forever on earth.
.. ..(Revelation 7:9-11,13,14) Look! a great crowd, which no man was able to number, out of all nations and tribes and peoples and tongues, standing before the throne and before the Lamb, dressed in white robes...11 And all the angels were standing around the throne and the elders and the four living creatures... 13 These who are dressed in the white robes, who are they and where did they come from?...These are the ones that come out of the great tribulation [compare Matt 24:3,21]