I hate to break it to you, BUT a generational talent does not result from dominating on the minor leagues. Only after they have done it at the major league level, do they deserve that descriptor. Until then, they are only top prospects who may or may not meet expectations when they get to The Show. Other sports are no different, with plenty of top NFL, NHL, NBA picks crapping the bed.
That said, Vlad is only 20 and he could very well become a beast at the plate (it took Devers a while after coming up in a similar way as a 20 yo dominating AAA). The difference with Devers is he could be a little bit out of the limelight that Betts, J.D., et al were occupying. Vlad suffers from being the Jays 'great hope' on a team rebuilding mostly from scratch - too much pressure on a 20 yo 'kid'.