Some detergents can have effects on the ability of ZDDP to act as an anti-wear agent. The problem is that the types of detergents used in specific brands is usually proprietary. Most race oils (Brad Penn, some Valvoline, others) are careful not to use high levels of detergents that will off-set the benefits of ZDDP.
ZDDP certainly isn't the only anti-wear compound in motor oils, but it is one of the few with an element with a nice NAA signature (zinc). It's hard to tell ones with hydrogen, carbon, etc. from the oil itself.