You only know these things with the benefit of hindsight. In hindsight, better choices were available. On the day those drafts were held, it was all conjecture.
The le of this thread poses the question of whether or not Ian is a bust, not whether or not drafting him was a mistake. Those are two very different questions, at least to me.
My understanding of the word bust when used in connection with NBA/NFL draft scenarios does not include a case like Ian's.
As I stated earlier in this thread:
The 28th pick, by definition, cannot be a bust.
At least as I understand the meaning of the word.