But there was a valuable lesson... How Justin Kan fundraises is irrelevant for you and me, because we aren't Justin Kan. There was no rational basis for Exec to have been worth so much at that time, but when you are Justin Kan that isn't relevant. And look, good for the Justin Kans of the world who can take advantage of that, but that doesn't mean it is helpful advice for the rest of us.
I can say from experience that going into VC meetings with a bunch of false bravado, hoping to "hold the tension" and out-negotiate the VCs is mostly irrelevant advice. By far the most important thing for the average founder is getting the VCs to look up from their phones and care or be interested in your pitch, which isn't going to happen unless you've created the right fundraising dynamic for your company.
One of my favorite Paul Graham essays of all time, "How To Raise Money" [1], fully captures what my experience was in the fundraising realm, both when it went well and when it went poorly. I'd point you there for more practical advice.