Ekitike probably cost Liverpool for €95m. That's a lot of money. Also you said that he's cheaper than Isaak, but i'd consider him riskier bet than Isaak. There's only 25m gap between his price and Isaak. I'd go for Isaak 120m rather than him, but sadly Newcastle would never sell him.
Some transfers require risk, and risk can lead to the trophy you desire. Liverpool took a risk considering the cost of this transfer, but if it works out the way they want, no one will remember the transfer fee. I think major clubs should make similar transfers and bring in surprise players.
I just don't wanna see Ekitike to have the same path as Nunez. He's far expensive than nunez, and not PL proven. I expected Liverpool learned from their mistake in Nunez's transfer, but they weren't.