He's not really a target man though mate.
He drops deep or out wide and that in turn gives more space to a main striker or him the space to turn and shoot (as Zat is saying).
I think Koeman's aim is to go 4-3-3, and the plan is still to have Barks as part of that 3 - it's whether he can get the consistency to do so.
Signing a player like Gabi gives us options to play many formations.
Im gonna be honest, ive delved deeper into his stats, he doesnt score many goals and he doesnt assist many goals, hes barely even played at Napoli the last 2 years or so, but hes available for "only" 20m and its a deal we can get done, hence why I think he will sign, I think he will do well here, hes basically an Italian Naismith, without the niggle.