I don't know why this is a mystery to you. I've pretty much explained it. But that's cool, I'll explain my reasoning, not that you do the same. You make statements and I guess they stand just because you make them, IDK.
But here goes, Philly didn't have to move up to get this guy but they did. They believed he was a must get. They believed that the Giants would take him and they couldn't have that so they moved up. If they believe that he is a must get, and there was just a report on that, that this is, in fact, how Philly saw him, then his value to that team is increased. The chart is no longer the measure because the value to Philly is increased. That, plus the fact that you are trading up into the top 10 of the 1st round. That carries it's own value as well. Lastly, they have more picks then they can use this year. I believe that we could have gotten them to give up more.
But I'm willing to listen. Show me this crystal clarity you speak of.
1. Draft trades virtually always hew very closely to the JJ value chart. When players and/or future picks are involved, things get a little muddy, but otherwise it's just about always true.
2. Trading into the top 10 does not "carry its own value." There's not generally a premium to trade into the top 10, based on trade history. The top 1 or 2? Yes, but not 10.
3. The trade we got from Philly was already them giving up more: it was a clear win by the chart. They were in fact desperate to move up and they did in fact overpay.
I looked at all the trades up to picks in the 5-15 range since 2000. Virtually all hew close to the chart; in many cases, the team trading up underpays. I found one huge and one moderate overpay:
2017: Bills gave 12, 53 and 56 to move up to 7 for Josh Allen. That's a huge overpay, 25+%.
2011: Jags gave 16 and 49 to move up to 10 for Gabbert. About 8%.
The Cowboys got over a 5% overpay from the Eagles. If they had given us their second rounder, it would have been an 18% overpay. Nobody has traded anything close to that for a non-QB player in a long time, and there's only one single example of a team overpaying that much for a QB.
This is why I do not believe we "could have gotten them to give up more."