Solo climbing is not all that bad. Many people (including mountain climbers), however, cannot get that idea, just cannot accept the fact that there are people not only skilled enough to but who also love being in solitude. And obviously I'm not referring here to Avalanche Gulch on Mt Shasta in the popular season.
AG is a perfect route to learn, to practice, and to gain some basic mountaineering experience in a challenging but "reasonably safe" environment. What else can one dream of? I agree with all posts above because everything mentioned is based on facts, but it does not mean it would happen to
azzi over this weekend. It is correct that he is dangerously determined to succeed but real wisdom comes with experience, and he needs to gain this experience. AG is the optimized choice to gain some experience due to its characteristics and the fact it's over 14,000 high.
As I mentioned in my previous post, it would be very unlikely to be solo on that route on a "nice weekend." This could be a perfect opportunity for him to learn from others, just by observing other climbers' behavior, where and when they go, as well as the surroundings such as what's happening with the snow and the sky. Due to his determination just imagine him taking the same route during the weekdays in bad weather conditions; no one to get any feedback from, no ranger to turn him back and so on. Not to mention his family worries and SAR efforts in case of his disappearance. So I would say he is OK, he did his homework as well as learned from you on this thread. It does not matter if he summits or not, the experience he gains matters.
If I told you the way I learned mountaineering you would most likely have banned me from all mountains.
However, this is another story.