VK is definitely mentally soft as it stands right now. Doesn't mean he will be forever though. Physically, he was never a hard nosed tough guy mucking it up in front of the net and obviously he needs to beef up as nearly all teenagers do but that is not concerning at all. The mental aspect, however, is. You can excuse away the mental softness saying he's only 19 yr old, but it is what it is. Unless he was hazed, asking teamates not to tease you as you struggle and pout is weak. There are no 'safe places' in professional sports lockerrooms, for better or worse.
No one is saying to draft only tough guys with no skill jfc. But you need mental fortitude to play on the big stage where everything you do is micro analyzed, and so far VK has not shown he can handle it.