I don't think he has a huge marketing value or potential yet, there's currently only 8m followers in his instagram account. For comparison, Ronaldo has 260m followers, Messi has 190m followers, Neymar has 140m followers, Mbappe has 49m, and Pogba has 43m. Even if he joined us and become huge success, there's no guarantee his numbers may grow by alot.. For example, Bruno only currently has 4m followers even after being a huge success here, Rashford, another biggest star in our team, only has less than 10m followers, so its not guarantee his numbers may grow by alot.
Bottom line is, he looks ugly, and his football isn't very appealing, despite his huge goalscoring impact.
So, commercially he probably wouldn't offer us anything extra. But if he could guarantee 40+ goals for us every season, then maybe we would have higher chances to progress further in CL and winning trophies too. That would bring us more income for sure.