I feel like you left out a lot of plot points, Chad still being a undercover agent, him and Numbah 1's deep friendship , You didin't even mention Splinter cell which was important to the whole galatic KND thing cause Splinter Cell was they cover
Also, Lizzie dumping Numbuh 1. It's believed that she dumped him not because she didn't love him anymore, but because she fulfilled her mission of finding out if Numbuh 1 is worthy of being with the GKND. Personally, I believe she did really love him because of how sad she was at the end of Operation G.I.R.L.F.R.I.E.N.D. Plus, she tried to warn Numbuh 3 and Numbuh 4 about the GKND destroying the world. If the GKND ever comes out, it looks like she'll have a bigger role on there than she did on Codename: Kids Next Door
I really do hope they will. I'm 30 now and still love this serie with heart, yup I'm taking care of my inner child. I mean if Cartoon network released such shit as newer version of PPG then why not this miracle?