What is ultimately confusing in Blood Omen 2, however, is the fact that Kain possesses the Soul Reaver. If Kain (the elder) prevented Raziel from entering the Reaver thus making it the Soul Reaver, the Reaver was never found in the Serafan Keep where Raziel was consumed, and never taken to Avernus Cathedral where it is found in the first game - so where did he [Kain] get it?
One could theorise that because it was Avernus Cathedral - a place inhabited by the Guardian of Dimension, Azimuth - perhaps a Reaver from another time where Raziel had been consumed was summoned (by Azimuth), perhaps even from another dimension, and was later placed conveniently in one of the many rooms of the cathedral (where Kain would eventually find it). And that is why Kain (the younger) has it. It could very well be the case, however I doubt it - still, the paradox provided at the end in SR2 might have been monumental, and with every paradox the binding weakens (between the realms and perhaps even with other dimensions, and that could have enabled another Reaver to be summoned).
Other than that thing with Vorador - which could very well have been resurrected by Kain, or by the elder Kain when he changed the course of history with paradoxes (most notably the ones in SR2), he could somehow have survived the onslaught of Moebius' cutthroats and escaped - another thing that I find puzzling about Blood Omen 2 is when Kain meets Janos. The one thing I find missing: the vertigo.
In SR2, when two of the same constants met, there would be, as Raziel described, a vertigo; a sense of displacement. Like when the spectral Soul Reaver and the physical Soul Reaver met and collided. You can probably see what I'm getting at: the Heart of Darkness. The younger Kain still has it inside of him, as would be the obvious conclusion; hasn't been ripped out yet. As does Janos, reinserted and provided to him by the elder Kain (by the hands of Raziel, but that is irrelevant). Two of the same constants meet. So where is the vertigo? Where is the sense of displacement?