I simply don't rate him as a player, and would sell if we got a half decent offer. I was obviously happy that he scored, as it meant we went 2-0 up, but he was a nuisance for our team, particularly in the 1'st half where he was offside 4-5 times and got in the way of that 1-2 exchange between Vuci and Marchisio. His goal came at an opportune moment for the team, and it was decisive. However, his performance was very average.
As for Trez, he could be very frustrating and anonymous at times, but he was clinical and decisive in front of goal more often than not. Trez was also a scorer/finisher first and foremost. He wasn't required to contribute to the overall play. If you want to compare Gio to someone, compare him to all the SS's out there, not the forwards. In that respect, and compared to others who play his position, he is very average.