He is not there yet, still can be useful. He scored vs Inter, Napoli and Atalanta - a big game player? He could be a bench player for us, the only problem are the wages...
Immobile is great, he is mobile, know where to go, shot like a predator
Watching some of Lazio games, he sometimes just unlucky on his finishing by hair or hit the post
He can get more goals if he is lucky
But Lazio games plan is to support him as he is the central goalscorer, same like Aguero for City, or Ibra for Milan, Lukaku for Inter etc
Our gameplan is Ronaldo is the finisher, but he is too far away from the goal