well, as all that i see in S4 don`t think that Aeroslo is smart enough so to help the mole destroy CSI M lab or help Mala Noche gang to kill H... this for me won`t be the reason H to chase her killer all S 5 epis...but here have a little possibility she Aerosol to be kill by mistake, Mala Noche gang is hard pressed and they go off the country...but not before tell H that they will kill everyone 'close/near' him...and guess what?! they somehow understand that H family is in Brazil... this is my version if this is not like this, i just don`t know how exactly or what way the writers can choose Y returning again in CSI M... but if Aerosol betray H don`t think that he will go to cry at Y shoulder. till now in S4 have a lot new stuff for H and will be a lot complexity CSI Miami writers to bring back H/Y moments from CSI M S 1-3 without this betrayal (don`t think that H is so stupid so to let Mar-EEEEE-Sole to use him. HE STILL IS MY HERO) . for me , this is my opinion ... from spoiler :Horatio learns a surprising fact about Marisol she the bitch is pregnant or don`t have cancer...H will do it with Y around but if my man is catch up on Aerosol`s lie i`ll be very disappointed by him...