Griffiths and Elton have next to no ruck experience, they haven't even established themselves as AFL footballers let alone second rucks.
I still maintain that if Maric goes down, we're going to struggle big time, particularly if Vickery has another wretched season like he did last year. Big O will be competitive but he's no world beater and McBean is four years away from senior football.
As far as generational change is concerned, we'll still need to recruit replacements for Maric & Big O in the next 3 years, that's where Collingwood are pretty much set for the next decade. If Vickery struggles, you may as well make that 3, and to be honest, if we're banking on 3 ruckmen in free agency, we'll probably have to pay well over market rates.