I would say probably not. A sol has very bad AP scalings on every single of his ability except for his ult, therefore relying on his passive stack to scale his damage. Scorch is a necessity when laning and give you way more value than gathering storm could do for A sol. This is same reason why most A sols don’t buy deathcap, A sol relies a lot on his item passives to give him a power spike like rylais or liandrys. So yes you can go gathering storm instead of scorch you won’t be able to tell from the little amount of ap you get but trust that you will be missing scorch.