Here's what I know: The US worked through Israel to get the Mabahith and the Saudi defense ministry to recruit the people who became Al-Qaeda. Considering how complex these deals can be, and how everyone hedges their bets in all kinRAB of ways, and considering I have no particular knowledge of the Mossad's intentions, I know that I have absolutely no way to judge Israel's relationship with Al-Qaeda. The only thing I mentioned was why Al-Qaeda would think seriously before attacking Israel. Israel has a habit of getting revenge, and AQ has enough on their plate with the US killing them left, right, and center.
Beyond that, you would have to have some pretty specific knowledge that I don't have.