I suspect some of the captured intel will implicate the ISI so completely, the Pakis are already counting on a much changed relationship with the U.S. once it’s analyzed. OBL being dead doesn’t mean he’ll never talk...Score one for the digital age.
In most cases, I could completely agree with you. I don't care Osama is dead, because we have his hard drives. That's where any plans or organizational data will be stored, contact lists, etc. A treasure trove in some ways more valuable to intel personnel than the owners themselves.
That said, there's some things that won't be on computers or hard drives, and not because they're being hidden. If the ISI was putting up Osama in their safe house, they probably didn't have him sign a rental agreement and email him a copy. This coordination were likely done in person.
There may be some very convincing data showing that Osama and the ISI were working together. Still, I suspect the relationship was more of the ISI keeping Osama in a guilded cage, and less of an active partnership. That kind of protection deal wouldn't leave much in the way of paperwork laying around.