Yeah, I feel that they are aware that Darwin needs some settling in time to find his feet in the team/league. The time to have brought him into the team was probably when they still had Many and Salah functioning at their insanely high level.
Bringing in someone who is guaranteed to score whilst not looking like an immediate replacement would potentially alleviate Nunez' struggles so far. Issue is, it's looking like Gakpo doesn't really fit the bill as that sort of player. Someone like Trossard would probably have been a better option, and more in-line with the sort of players Klopp likes working with.
Gakpo may come good, and I liked him at the World Cup, but he looks like another long-term project rather than here-and-now fix.