Liverpool has't stopped yet. They're trying to hunt more talent to be recruited. They have done with Frimpong, Wirtz (medical check up), Kerkez, (still in the negotiation), and add Isaak as their last target. Their target to sign Isaak from Newcastle is just getting even more possible with Nunez who is still in the process to go to the Napoli(i expect him to play for that italian club).
I think we will see Isaak to wear Liverpool's jersey as he has open the move to the any big club that play in UCL.
The Newcastle forward was one of the most deadly and effective on his job last season, he presence upfront tormented defenders that they couldn't believe their eyes and if Liverpool gets to get their hands on him then it will just make their team so strong and ready for the attack upfront since they are ready to let Nunez go due to poor performance and all expectations wasn't met with him.