The JW two-tier Christianity is predicated on the fake type/antetype dogma that the 'other sheep' picture the foreigners who left Egypt with the Israelites and weren't participants of the old covenant - only 'beneficiaries.' Try telling that to Rahab & Ruth!
wt 98 2/1 p.19, par. 6 - "Further, other sheep lay hold of the new covenant just as foreigners of old laid hold of the Law covenant. In what way? Not by becoming participants in it but by submitting to the laws associated with it and benefiting from its arrangements."
Deuteronomy 29:10-15 blows this anti-scriptural teaching & its 'type/ante-type' implications clear out the water.
But of course, JW's are spiritually illiterate and can't read/understand the Bible - unless the 'slave' guides them.