Diaz is a terror for Liverpool and hasn’t much more muscle than Gil. I watch almost all the Valencia games since Gil went there. He is closer than some appear to think on here.
Often thought that, Dias looks epic (and is clearly), because he's given exactly the right run n rest demands, they cycle attacks. Gil was just a magnet until burned out in 20 minutes, in our disorganised mess he was being dropped into.
His lower body to core looks fine, and, it needs real care adding weight to carry for jinky runners up top (would rather he be left to mature, not sure he's stopped growing by his looks, just core core core, no pushing it to bulk IMO). He's a potential Bernardo Silva, quick minds and great vision don't need muscle (Eriksen, barely won a 50/50 in his Spurs career, mostly didn't need to cause he knew space).
Just games to build resilience, and, more awareness of tank management.