“Still shooting speed is virtually the same—the D7000 can shoot 6fps while the D300s fires at 7fps—and if you add the MB-D11 battery grip ($260) to the D7000 it’s exactly the same.”
“If you add a battery grip ($250) to the Nikon D7000 you can shoot 7 frames per second, making this camera well suited for a range of assignments.”
Nikon never publicly acknowledged that the D7000 has an increased fps when used with external battery grip.