I've notice that people often mix up songs when writing about the documentary, so could this just be confusion with how VOL was written?

This seems as good a place as any to put my own question. In the 1979 Rolling Stone interview with the band, Don Felder describes himself as the "musical catayst" in the band. Any ideas what he meant?

catalyst noun 1 chem any substance that catalyses a chemical reaction. 2 something or someone that speeds up the pace of something, or causes change.

catalyse or (US) catalyze verb (catalysed, catalysing) chem said of a catalyst: to alter the rate of (a chemical reaction), usually by increasing it, without itself undergoing any permanent chemical change.
I'm just trying to understand how he fitted into the creative process. I know that the instrumental tracks were usually laid down first often before there were any lyrics. We get a glimpse of that in the "Get Over It" part of the documentary but Bill Szymczyk has also mentioned it.