I don't see why is Zverev favoured here. He played against Jarry, who is a claycourter and has a very little grass experience, Johnson who had 7 double faults in his 4 service games, clearly unmotivated and it seemed at times he didnt wanna be there, and last round Shapovalov, who also has very little grass experience on main tour.
I think theres some value on Kukuskin.