Uh, please stop. Those aren't upgrades.
Seriously you have no idea how good Wennberg is.
He's Selke caliber defensively. He had 39 pts in his last 54 games (a better pace than Henrique scores at). He has 3 pts in his first 2 this year. Zacha is a prospect, who might end better, might end worse, either way sets the clock back on the rebuild substantially.
** I'm not saying he is definitely better than Henrique right now, but if he's in the same neighborhood in terms of effectiveness now you can bet he's worth a lot more, being a 21 year old with #1C upside.