"Is it Don Henlys creativity that created those classic guitar solos at the end of hotel California? Do you think they are just jamming nonsensically?"

I hate to be persnicity here, but Don Henly didn't really have anything to do with the guitar solos at the end of "Hotel California." It was actually a four track work tape that Don Felder had for a couple of years before Henley and Frey put the words down. The guitar solos for the most part as well as all the music was his. When they recorded it, Joe Walsh took what he had already done and added his own flourishes on it. But they all took months to work out, so it was not just "random jamming."

Some things in that era were discovered by mistake and jamming, but by the time it got to tape had been worked out meticulously over a period of time.
I agree with a lot of that post, this is just one part I know a bit about.