Page did a lot of overdubbing his parts to get that “full” sound. Listen to “Dancing Days” for example. How many guitar parts are in that tune?
everyone overdubbed- its par of the reason Queen was fractional in concert versus their album (i saw Queen in concert 4x in the late 70’s early 80’s)...Zeppelin live took the songs to another level.
Like Dancing Days-> https://www.youtube.com/watch?v=RYPsm_tPIlo