"He could have chosen a better role model." Itachi wasn't even a good brother, let alone a good role model. He tended to be more goal oriented than anything else and forget personal commitments when he got too busy. "But I will try to spend more time with him." He should probably do that without it being under the pretense of testing him.

"I'm afraid avoiding bias is impossible," Itachi admitted. "I'll be harder on him than I would be on anyone else." Because Sasuke was his younger brother, and Itachi needed to be sure he could defend himself properly on high risk missions, or he'd never be able to recommend him for Jounin.