Sure, he can always go lighter. Been there... It is fun, but it is not always the best IMHO. I have been on overnight fishing trips with just a bag and my cup.
(Well, a bit more, really, but it all fit in my fishing vest...) But, we can talk about that some other time. A single homemade staff only weighs 4.5oz. And costs less than $10.
In Southern California, I am guessing you can still get out with your gear. Here in the colder climate of NY, I envy you. (Too old to do winter camping anymore.) You will need to get out there and practice with your new gear. You may not trust some of it fully...it IS new, after all. Stay as dry as possible. Bring an extra set of clothing till you get comfortable with what you have. Get used to the stove/pot combination. Monitor your fuel consumption, but, bring a little extra till you *know* how much you will use. Practice setting up the tent. And, taking it down. Don't worry too much about milage, you will get used to doing 20mi/day. Make sure you bring an extra water bottle or two. Till you know exactly how much you need, don't try to cut back on water...bring enough. There are ways to cut back your food till you can get by on about 1.2-2# per day. Enjoy the light pack and light weights on your hikes. Again, A well done job! When are you going SUL? (hey, hey...)