I think his decision making and football IQ is one of his best strengths actually. He reads the intentions of those around him very well, imo, always looking to move to where play will be, and not where it is. These are the qualities of players with superior mental capabilities.
I feel like one of the bigger problems he had is that none of his teammates really looked to pass to him much, especially when he was actually in dangerous positions, like when we were on the break or counter, and he actually had space to run into. Most of the rest of the time our team just seemed to dump him the ball in a crowded final third after they had already brought play to a standstill, looked around a bit, and decided that there were no decent other passes to their friends available. Then, when he did get the ball, they largely just stood around and watched as he tried to do stuff. Our B team was/is truly goddawful this year, especially pre-Conte.
Gil is in constant motion off the ball, as a good attacker should be, and clearly is looking to play higher level pass-and-move football with other higher-wavelength players. We basically surrounded him with a bunch of poorly-coached, out of form, selfish, in-group-clique wankers. Shouldn't be much of a surprise he didn't flourish in that environment.