Was he really that much of a project? I mean - he had a dominant showing against the best U20 players in his draft year, he was listed at 6'0 195 lbs when drafted, etc.
I remember the conversation around Zadina in his draft year being focused around -- how good of an athlete do you think he is, and how much room does have to get better athletically.
@The Zetterberg Era literally said exactly this on Zadina before the 2019 draft, and was not high on him because of it.
If he was already pretty maxed out, and was not the best athlete, then I don't know the development path taken is to blame. That may have been an issue regardless.
I am not even saying Zadina is a failure, but some players just fail because they had flaws that could not be improved upon, or because of X/Y/Z. You don't have to make excuses for how they were developed EVERY SINGLE TIME.