@SMC.. Your president had engaged UN for creating this report and has accepted that report with satisfaction. Any evidence that may have been required by your president to feel satisfied would have been shown to him only
Associated Press Of Pakistan ( Pakistan's Premier NEWS Agency ) - Babar satisfied over UN report, says it has given direction to investigation
What was he satisfied about? Clearly the report was more about BB's death, so he may be satisfied about that. That's what the article and other articles mentions.
And more importantly, using satisfaction of zardari and PPP as an argument? That's not a very good argument.
To date I have not seen any credible evidence of ISI involvement nor any mention of anyone giving evidence of ISI involvement to others.