While wielding the staff, you gain a +2 circumstance bonus to checks to identify evocation magic.
So I guess the question is, are you considered to be wielding the staff while it's fused and so get the passive bonuses in weapon form? Or do they only apply when you switch it to staff form?
That makes sense to me, and I had seen the part about being in staff form. I just wasn't sure if the fusion meant that you were wielding the staff even in weapon form.