Well pretty certain that the other two are two of the other three classic Bordeaux varietals: Cabernet Franc, Petit Verdot, and Malbec, although Carmenere, Gros Verdot, or St. Macaire could also feature but those are rarer in Bordeaux and in "Meritage" wines in the U.S. (trade name for non-Bordeaux wine blends made with Bordeaux grapes). Of those Cab Franc is most typical, followed by Petit Verdot; but I'm guessing that Malbec is more widely grown and available for a reasonable price in Lodi (vs. Petit Verdot), but I cannot find good figures to support that guess. But either way I'd guess the first listed, Cab. Sauv. is the most prevalent, and that Cab. Sauv and Merlot dominate the blend, ideally supported by Cab Franc and Petit Verdot.
At least on the Super Tuscan they list all three varietals, Sangiovese, Cab. Sauv., and Merlot and I'm guessing that is the rough order of prevalence.
I'm guessing that they don't want to list %s as that may vary over time, not only with pricing and availability but also what makes an ideal blend one year may not make one the next year.
Cool chart of red Bordeaux varietals by prevalence in Bordeaux:
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