"Too bad for Halutz" - Ahmad Abouali A little while back Halutz himself was arguing against reoccupying Gaza. At no point does the article say Halutz was an advocate of reoccupation. The 'investigation' is taking an awful long time. I think, for some of the reasons you mentioned, and political and geopolitical reasons, Peretz does not want to make things worse until he gets a straight answer.
from the article: IDF hard-pressed to pinpoint cause of Gaza beach deaths