The first part was simply that there are a lot of game changers who flourished early who haven't won anything, just as many are on teams that haven't won cups than on teams that have won. Nothing more than that.
Picking top 5 matters, but it's not everything. The guys above were picked between 2003-2009. There are 10 listed out of 35, and while a couple more could be added that's still 70% who didn't have that kind of an impact. But my point wasn't that picking early doesn't matter, it's that it is way to early to say the Kings don't have the game-changers necessary just because they aren't flying out of the gate like some others. Look at the Blues who won a couple years ago.
1. Ryan O'Reilly, great player, captain, leader. Broke in the league at 19 and put up two mediocre seasons. Gabe Vilardi broke in at 20, and he missed a crapload of time because of his back. He's put up substantially better numbers than Reilly did early in his career.
2. Jaden Schwartz, very good player, but not game altering - In the AHL at 21, put up 19 points in 39 games. Turcotte put up slightly better numbers despite being a year and a half younger when he started in the AHL.
3. Pietrangelo - Should probably be on the above list, he's a top 5 pick that's a game changer who came out on fire.
4. Tarasenko, in the game changer discussion - Wasn't doing well in the KHL as Turcotte, Byfield, Thomas, or Kaliyev did in the AHL. Different leagues, but the KHL is a lot more wide open, crappy defense, and at the time had the bigger ice surface, All of them are similar age or younger than Tarasenko was. Kaliyev in particular looks a lot better than Tarasenko did early.
And none of that means a whole lot because it's too early to call.
There are also high picks that started well and then fell apart, like Jordan Staal, Gagner, Bogosian, Setoguchi, and Mueller. There's a group of top 10s that scored in the 30 & 40s points wise right away then never improved on that. There's a good sized group of late starters who didn't start well but turned into fantastic players. It's way too early to tell if the Kings missed the boat on a guy like Zegras or Caufield just because Turcotte isn't in the NHL yet, just like it's too early to figure out who the true game-changers from 2019 are.
I know you are high on Zegras but 60 points next year? Sure, it could happen, but don't forget Vilardi was on a better pace as a 20 year old. I'm thinking mid 40's.