Yes, it is quite possible it is other modules causing the hibernation problem. It is well known that graphics and network chipsets can also be problematic.

The sound modules need to be unloaded before alsasound service is stopped, because it depends on them. You can test this easily, as I have demonstrated in previous post from a root console. You should get no errors after each command is executed if there are no dependencies to sort out. The script just automates this process.