Can you get me a source on that, i know about the kidnapings but i cant find anything about the chopping bodies up part.
I'm pretty sure Robert Fisk relates the story in
Pity the Nation. He either reports it as hearsay, or say that the KGB threatened to decapitate one of the kidnappers uncles/cousins/something. It sounded like mythos or rumor, but then again, isn't starting whispers like this that the point of that kind of brutality?
Anyways, Bin Laden, like a lot of the Arab fighters in Afghanistan, was a sort of rich-boy Jihad tourist. These guys would fly in from Saudi or elsewhere in the gulf, stage photos of themselves with RPGs and AKs, take part in a few raids or ambushes, and then quickly tire of the whole thing after a month or two. The Arab fighters were valued for their money and the organizational abilities they brought with them, not really for their military potential.
If the USSR begins to gain an upper hand, and the Afghan Communist regime is propped up to some sort of self-sustaining level, I think that the Afghan resistance would quickly become an ethnic-based (whoever isn't in the government) rural, militantly Islamicized, ISI-funded low-level insurgency somewhat similar to what the US is fighting now. The Arabs would leave and the CIA funding would slow, but not stop.
Where does this leave bin Laden? Well, I don't think the USSR would stay on the top of his list for very long. A US thwarted in Afghanistan and dealing with a persisting cold war would be more involved (if such a thing were possible) in the middle east than the OTL US in the 1990s. Ever since Sayyid Qutb planted the seed of Al-Qaeda ideology in the 60's, there was a strong anti-American sentiment among the general anti-western ideas. Anticommunism was par for the course, but that was a position that was assumed, and not a lot of time or intellectual effort was spent exploring it among Islamist theory. Fact of the matter is that radical Islamism is a reaction to western cultural, economic, and political penetration and influence in the Middle East.
The material culture, social mores, and political influence that so angered Osama bin Laden and his followers all came from the Cold War era west. After the temporary (but formative and essential for the movement) Afghan Jihad, he would probably turn his focus elsewhere- to the US and those who he sees to support it in the Arab world.