None of that is that unique. Even if we only look at 1989 squads, UNC, Louisville, Syracuse, and UNLV had more once and future first-rounders playing for them. And teams like Georgia Tech, Arizona, and Duke matched them with 3 first-rounders. And arguably the most talented team that year was a team unnamed thus far, Georgetown. And that's only if we narrow it down to non-title winning 1989 squads with an emphasis on NBA talent.
I imagine you are or know an Illini fan. That's fine. I'm a UNC fan who will go down with the good ship '98 as the best non-winning title team of late, where Vince Carter was a first-team All-American and still only the second best player on his team, depth be damned. We know what we know. But five NBA players who had fairly humdrum careers at best don't really move the needle for me as far as historically talented squads go.