I don't usually follow celebrity cases, but it looked to me like the jury did not buy the Prooscetuion's case, in part because the murder victim had a history that produced a list of suspects as large as the Manhattan Yellow Pages.
My husband and I both agreed that we probably could not have found him guilty either, for the reason you stated. I personally believe that Blake is guilty, but there were too many other people who had motive to kill her. The presumption of innocence is on his side. In another system where that presumption is guilt, then I would find differently, I think.