Just reporting, not supporting...
This was a topic that interested me as a jw, how did the WTS determine in general who did or did not get a resurrection, imperfect people.
It centers around their idea of what a "judgment period" is. The flood, the destruction of S&G (off and on of course), and those killed during Armageddon were considered having died during a JP. For awhile the WTS defined the period between 1918 and Armageddon as a judgment period and people dying then (not jws) would not not get a resurrection, descending into Gehenna, eternal destruction. The period after Armageddon and before the final test at the end of the 1,000 period is a JP as well, failures descend into Gehenna. Buddha as far as I know did not live during one of those times and the WTS has rescinded the teaching that people who live between 1918 and Armaggeddon and die will not be resurrected.
*** w52 6/1 p. 334 pars. 4-5 "Get Out of Her, My People" ***
So we must make God’s thoughts our thoughts, if we are to see in clear focus and true perspective Jehovah’s destructive acts at the end of judgment periods. If we persist in tenaciously clinging to the self-centered human view that focuses on creature salvation and leaves Jehovah’s vindication in the hazy, out-of-focus background, we may find the Scriptural teaching a hard saying unwelcome to our ears, and be offended and stumbled by it.—Isa. 55:8, 9; John 6:60, 66.
5 It is likely that for the majority of men who have lived on the earth the time of their judgment will be in the millennial reign of Christ, at the time of the resurrection of mankind and thereafter. However, long before this many persons will have had their time of judgment, as the Scriptures show that God has brought certain judgment periods upon human society at certain times, during which God held them accountable for their course of action. That they might be really accountable at such times, he caused testimony to be given that they might know the issue and make their decision, by which they would determine their destiny, independent of any inherited condemnation from Adam. One of such judgment periods was the flood of Noah’s day, prior to which Noah preached righteousness. Another was the fiery end of Sodom and Gomorrah, which cities saw warning miracles by angels and heard testimony from Lot before the rain of fire fell. In Jesus’ day it was a time of judgment and he warned certain Jewish cities of a fate like that upon Sodom and Gomorrah, and judged certain scribes and Pharisees fit for the eternal destruction of Gehenna. Our present day is also a time of judgment, and by the time Armageddon strikes all persons then living will have fixed their destiny.
*** w52 6/1 pp. 335-336 pars. 8-9 "Get Out of Her, My People" ***
After showing the flood typical of the present judgment period, Jesus proceeded to show Sodom and Gomorrah pictorial of it also: "Just as it occurred in the days of Lot: they were eating, they were drinking, they were buying, they were selling, they were planting, they were building. But on the day that Lot came out of Sodom it rained fire and sulphur from heaven and destroyed them all. The same way it will be on that day when the Son of man is to be revealed." (Luke 17:28-30, NW) Our previous consideration of 2 Peter 2:5-9 has shown that those destroyed by God at Sodom and Gomorrah are eternally "cut off". Corroborating this is Jude 7, which states that these cities are "placed before us as a warning example by undergoing the judicial punishment of everlasting fire". (NW) "Everlasting fire" symbolizes the same thing as Gehenna, namely, second death. The destruction upon Sodom and Gomorrah must be final, or Jude would not have used it to illustrate the fate of those defilers for whom "the blackness of darkness stands reserved forever". (Jude 13, NW) Jude 7 shows that those ancient cities had their judgment day back there at the time of their destruction, since they are spoken of as having already undergone an execution of judgment, "the judicial punishment of everlasting fire." By no wresting of scripture can this be made to mean a future resurrection for slain of the Lord. No remnant was saved from those cities, Lot and his daughters being sojourners, not natives.—Rom. 9:29, NW.
9 If those slain by the Lord at Sodom have no resurrection, then those slain by him at Armageddon will have none, for the former pictures the latter. So in their endeavor to prove their contention that not all slain at Armageddon will remain dead, some seek to show that the Sodomites destroyed by fire will return in a resurrection. They quote Ezekiel 16:53-55: "When I shall bring again their captivity, the captivity of Sodom and her daughters, and the captivity of Samaria and her daughters, then will I bring again the captivity of thy captives in the midst of them: that thou mayest bear thine own shame, and mayest be confounded in all that thou hast done, in that thou art a comfort unto them. When thy sisters, Sodom and her daughters, shall return to their former estate, and Samaria and her daughters shall return to their former estate, then thou and thy daughters shall return to your former estate."