I agree wit OJo comparisons, although Olli was a young arrogant dick / ass, and it prevented him to figure things out and developing.
I think Pulju's problem is different but the same. Something with the hockey-IQ, language barrier, mentally not yet matured enough, lack of self-knowledge and holistic thinking.
Both had gone so far with pure talent and maybe size. But when it was time to really work to get to the next level, they just even couldn't / refused to understand what coaches are trying to teach. Also doubt that work ethic is/was yet anywhere near it should be.
Takes some time to figure everything out. Can be successful or not in the end.