Per the Websites: G8: 40 College Coaches on the list to attend. The Grind: 89 College Coaches on list to Attend.
I wouldn't say the coaches are '"flocking" to the G8.
Who's playing at the Grind apart from TG and Integrity? Regarding college coaches - it would not surprise me if a bunch of them have double booked that weekend because of the proximity of these two tournaments.