that's a big enough sample size to say he's not juve material
he was appointed mid season, took over a shit squad that lost like 8 out of their first 12 matches or something similar. grosso never really had a chance with them. at the end of the season brescia of course got relegated, they were not serie a material by any means
it's like saying that gasp is a shit coach because he failed at inda. that inda was a huge mess after mourinho left
anyway, i wouldn't judge grosso based on his few weeks at brescia