It wasn't just for Jiang Zhi Shu, but rather for his entire plan.
If he were to give up this chance, it would mean the Jiang Family would be able to rise up from this fall and he wouldn't have a chance to strike them again. After all, after suffering this one loss, their defenses would be much stronger this time.
With the amount of resources the Jiang Family had, it was not something that Lin Fan could match with his newly built organization.
While Lin Fan was confident in taking care of them by himself, that was only because of how arrogant the Jiang Family had been.
Before this, they had been lax with their guard since they never expected anyone to actually target them. This was the lull that came with a false sense of security from a long period of peace.
But now that they had been alerted, they would definitely prepare all their defenses.