Luke also only got involved after being asked and he did nothing in particular. He held Diva so that she wouldn't attack Bigby and that was it.

I don't think this logic is good for us to follow. The staff members could have easily just sat back and watched because of course everyone would be readily willing to jump on someone who seemed suspicious.

I'd also point out that your list consists entirely of the outspoken people of both trials. I think it's more likely that they were the only ones willing to speak up because it's in their nature.