In the case of Tokyo Ghoul if Toonami had acquired it in 2015 it may have been considered a top anime grab. However grabbing it in 2017 doesn't exactly result in the same type of term being thrown out at all.
I guess Toonami didn't have the means in their budget or any openings back then for it, and this is where I agree that it does seem a bit weird that it has remained a top requested show for Toonami all this time