Technically he met Stone before he made the NHL, if you wanna get technical.
I'm not trying to discount the impact that Matt and Keith (among others) have had on Brady, but I think it's also important to have veteran voices in the locker room who can help guide him (among others). It doesn't need to be an either/or scenario, but having someone going through the same grind, on the same team, in the same city who can be a veteran leader can only help BT. If Pageau can have the same impact on BT moving forward as Stone had during that 2/3rds of last season then it's a win for everyone.