We're in that weird flux where Ronaldo is obviously still good enough to be our starting no.9 but owing to his age cannot play every single fixture. But I actually don't see how signing Nunez for a massive sum fixes much, we would not be signing him to bench warm most of the time, and I don't see how he and Ronaldo fit playing together in a 2 (and still fit in players like Sancho/Fernandes etc).
I think what we actually need is a versatile wide attacker who can play as a striker when needed. We basically need a replacement for MG11. That profile in the team (especially playing from the right) is a massive miss.
Someone with the profile of Nunez would be a season too soon, Ronaldo isn't going anywhere for another 12 months. Otherwise, signing a striker who's sort of there to just 'compete' with the current no.9 doesn't really work properly. Reminds me a bit of how Spurs cycled through Kane substitutes (Vinicius; Llorente; Janssen and so on...).