I think you’ll find extensive opinions on the matter in past years’ threads. Also, google pct-l archives and you’ll find a ton of banter pro and con about the Kickoff. There is even some on their own website.
I did section A in winter, attended Kickoff, finished work for a week, and then basically joined the herd from Warner Springs. I didn’t find it too crowded, personally. (But i didn’t do the first 110 miles with the crowd.)
Many start the Wednesday-Friday before Kickoff, and then continue on Sunday morning north from Morena. Several others slackpack in on Saturday or Friday. Several others start from the border on Sunday after Kickoff. And then many others start a week or so early and hitch back to the Kickoff. All have advantages. I’d estimate that of the 400 or so aspiring thru-hikers, half attended Kickoff. Of those 200, there were probably equal parts of the 4 strategies listed above. Roughly.
This year if the dry weather keeps up, you might do best to start a couple weeks early. Or not.
markv