You're literally making up completely random scenarios that have no barring on reality and you're arguing for them as though they're peer reviewed data.
Sophomore slump is real and the data behind it is relevant. You realize that players don't just play a game, and then go home for the next game right? That they actually practice, watch tape on players (especially goalies) and game plan around certain players?
You get guys like Elias Pettersson, who haven't encountered it. Or Brady Tkachuk.
You get guys like Andrei Svechnikov, who had a good season as a rookie, but you know can do better (and has).
Brock Boeser has been good, but he has had health issues. And he has scored less every season since his breakout in 2017-2018 going from 29 goals to 26 goals to 16 goals (but only 57 games played).
Barzal had an outstanding rookie season at 85 points, but followed that up with 62. More goals this year in 68 games. He should have hit 70 points this season (unless he hit a slump). Would you pay him more than 10 million a year and hope the trend swings back up where he is a point per game player or would you be okay with hitting around the middle (and around 7-8 million) as a 70 point player?
Clayton Keller went from 23 goals to 14 back up to 17, but hasn't hit 60 points since his rookie season.
Can't forget Yanni Gourde and his 64 points and how Tampa Bay paid him 5.1 million. He is starting to already decline.
Hischier has his struggles, including health.
DeBrincat tore it up dispelling the sophomore slump? Or did he? Because after tearing it up with 41 goals, he is sitting at less than 20 (and probably wouldn't have hit 25 this season). He may get lucky and hit 60 points.
You can find data to back up really anything, peer reviewed or not. Is there a sophomore slump? You'll say no, others will say yes.
But paying a player based off of one good season can be dangerous. A good example of this is Chucky. Is he worth 4.9 million a season? He had a 30 goal campaign two seasns before he signed his third contract (15-16 he had 30 goals, he was still trending up with 17 goals in 61 games). So the Canadiens signed him to a three year deal at 4.9 million. Is he worth it? Was Rask worth his 4 million dollar contract that he signed shortly after hitting 21 goals and 48 points? That is the going rate for a 20+ goal scoring and 48 point center...