Ha, maybe not end of season but 12 months..
Firstly, i don't see the "longevity of consistency" of Zaha tbh. From a year ago, it's close. From May, Sisto has outperformed him. This season, Sisto has completely outperformed him. He's been one of Celta's best players alongside Aspas and Gomez. He helped Denmark reach the World Cup alongside Eriksen in a brilliant performance away to Ireland. He has been top or around the top in the assist chart throughout Europe's top leagues where as Zaha has only scored a few goals for a team in the relegation zone. Celta are a mid- to top of the table side. They reached the semi of the Europa League only narrowly losing out to Man Utd.
Don't see your point comparing Sisto with defenders either.
Let's look at Pulisic. Obviously a massive talent but how has he performed compared to Sisto? Yep, worse. How did he get a +2 despite doing nothing this season? Hype and reputation, that's all.
How has Volland not reached 90? How did Sokratis get 92? How has Reus kept his rating while a player like Bernat got dropped for being injured? And so on and so forth..
While i appreciate the game and the people helping it, talking about longevity of consistency when there are such double standards regarding rises is.. well, you get my point.