Risk aggregation is all about ensuring that anyone looking at risks understands the relative importance of each risk and is confident that the appropriate risks have bubbled up to the surface. When assessing risks, there is essentially an opinion provided as to the expected impact and likelihood. In other words, there is no real certainty as to the timing or magnitude of a risk event.
Of course, if there were certainty, there would be no risk and insurance would be impossible as there would be no transfer of risk.
