Also, I remember reading that using both hs-CRP and Lp-PLA2 gives better diagnostic accuracy than either alone.
Quick review of PLA2 data indicates it is a moderate indicator of risk. Same ball park as LDL (but worse than CRP or LDL/HDL). So even if it is entirely independent of CRP (highly unlikely) it won't bring up the predictive accuracy enough. Perhaps if it added to totallity of other data it would be enough if independent - but I think that unlikely.