Vanderhoven,
Yes it's pretty accurate.
"Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither the sexually immoral, nor idolaters, nor adulterers, nor homosexuals, nor thieves, nor the greedy, nor those habitually drunk, nor verbal abusers, nor swindlers, will inherit the kingdom of God. Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God."
1 Corinthians 6:9-11
If you think that JWs believe in the blood of Christ and a lot of don't them don't do the above things they can be credited with righteousness. For some reason they can't see that. If you deny the value of Christ sacrifice then you cannot be saved. The original teachings of JW are supporting that only through Christ's sacrifice our sins can be washed away.
"Therefore if anyone is in Christ, this person is a new creation; the old things passed away; behold, new things have come. Now all these things are from God, who reconciled us to Himself through Christ and gave us the ministry of reconciliation, namely, that God was in Christ reconciling the world to Himself, not counting their wrongdoings against them, and He has committed to us the word of reconciliation. Therefore, we are ambassadors for Christ, as though God were making an appeal through us; we beg you on behalf of Christ, be reconciled to God. He made Him who knew no sin to be sin in our behalf, so that we might become the righteousness of God in Him. 2 Corinthians 5:17-21
"I said to him, “My Lord, you know.” And he said to me, “These are the ones who come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb. For this reason they are before the throne of God, and they serve Him day and night in His temple; and He who sits on the throne will spread His tabernacle over them." Revelation 7:14-15
The revelation 7 also shows that the great crowd will be able to make it through the great tribulation and to stand before God only as a consequence of washing their robes in the blood of Christ and made righteous.
No unrighteous will make it to that point.
"And they came up on the broad plain of the earth and surrounded the camp of the saints and the beloved city, and fire came down from heaven and devoured them." Revelation 20:9
The ones that will be on earth at that point are considered saints.
"having a hope in God, which these men cherish themselves, that there shall certainly be a resurrection of both the righteous and the wicked." Acts 24:15
Here also shows that will be people who will die as righteous before the day of judgement comes.
I will add something here to your summary. The JW teachings support that the 144000 of the heavenly class are credited with righteousness in this life but I can't see how other sheep will make it through the great tribulation or have a relationship with God through Jesus without being considered righteous.
As for the ones that didn't sin against the holy spirit meaning that they did not consciously rejected God after knowing him or deliberately rejected Him from the start, I can't tell they will not benefit from the resurrection in the Judgement day.