Three ideas: 1) Tzadikim bring the light into Asiya as they are above the world, 2) The struggle over Binyamin, Yehuda (Eved) and Yosef (Ben) each have a claim to him, because Binyomin was a Tzadik, whose idea was light, but a lesser light. Yehuda claims that Binyomin in his closeness to them may actually be better for elevating their Avoda, 3) LiAsid, the world will make itself a Keli for G-dliness by itself, and then certainly Yehuda (Maase’) will be higher than Yosef (Talmud). But the Tzadik (Yosef) will still make the Essence shine. Page 533-4, NEW SV p. 702-4
