In what way? Sierra had its head cut off (with the ouster of both Williams), Blizzard did not. It's very hard to compare the outcomes of both companies, because the internal political battles were a Highlander-style rochambeau where only one was likely to come out a winner. The article here even details how Blizzard was a direct contributor to Sierra's murder (via their past CEO Davidson) and a part of how Sierra's head got cut off in the first place.