He's only been able to play who he has available. The only other realistic options are Jota, Nunez and Gakpo and neither of them are perfect fits there for different reasons. In the summer he'll have some options to choose whom he freely wants for the position and then we'll learn more.
I don't know.
Peak Firmino would occupy the same spaces as Szoboslai. Don't know if that would be a partnership that strengthens each other, or they get in each others way and there's no one to stick the ball in the net in the 9 spot.
Probably more the latter.