the maharal explains on that gemara of 1/300k that it means from all the jews who lived in all the generations, many died or were killed. so what will be left when moshiach comes will be 1/300k. nothing to do with only some jews being redeemed. so by techiyas hamasim the jews will multiply 300k times. because all the jews from all generations will come back
about differences between jews, i dont know where you came up with those things that some jews are not jews ch”v or that hashem does not love some jews?!?!
here’s what the baal shem tov said – 1 example, for more, check the indexes of his seforim.
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