What a terrible terrible shame. This is the guy who founded the band. Strong rumour has it that it was finance related. Rob has allegedly insisted that he took 50 % of the band's income since his return (ego.....) and this caused huge fractions within the group.
I am very very skeptical about it being a health matter. Or if it is, ill helath has been caused by the strife. It must be very very very bitter departure and KK would not take such drastic action lightly. .