the covenant capital ships pulse laser cannon will most likely blast through an imperial star destroyer and the covenant would have emp shielding. the covenant don't hyperspace the use slipspace rupters and the Indictor ships are useless because the covenant can use slipspace even if there is gravity and for those AT ATs the scarbs will blow right through one with its main cannon. the AT STs won't stand a chance against the phantoms and banshee's fuel rod bombs.