Can We predict severity of Community Acquired pneumonia(CAP)?

A prospective study published in AJM recently has an addition to the world of CAP- C- Reactive protein.

I wish this study had tried combining these predictors to find how CRP can complement CURB65 and (Pneumonia Severity Index)PSI.

Currently, I will probably use all three to estimate severity until we have data to help me choose just one.