Just because we don't know it will happen, doesn't mean we can't be worried it might happen. Honestly, as a fellow CBJ fan, we as well as anyone should remember how easy it is to stunt a blue-chip prospect's development (I was pretty young in the 2000s, but I still remember fan-boying over Zherdev, Brule, Brassard, and Filatov when they got drafted (Voracek, too, even though he hit... What a sad day that trade was).
Fantilli is NOT a Picard or Brule, but there's 100% a chance that he gets put in over his head too soon and it stunts him in some way. Brassard looked really good as a young player, but never turned the corner to being a star. Sillinger looked good at 18, too... I think any CBJ fan would go back in time and not have had him in the league that year.
It's worth considering for any 18 year old, especially when some people are already writing Fantilli in as the saviour for our center ice problems and already as a top 6 center next year (I hope this doesn't happen)