Corey, Renji blocke Super star's Star fist bare handed. Whereas a star beam Punched through Rose. Face it Rose is a Weak Pussy-cat, and Kensei got destroyed by a weaker powered up Super-star. In other words, the enemy was less powered up when he beat Kensei to dust, while Renji barehandedly (no Bankai) destroyed the same enemy at an heightened power level.
Kensei and Rose are a disgrace for Captains, and all the Vizards are weak Pussy--cats.
In the immortal words of a Gamma powered green giant...Puny Death God
It pains me to admit it but you're absolutely right. The Vizards are pussy captains.