Were any of those players brought in to start like Pierre was, or had the track record at leadoff of Pierre?
No. Juan is a completely different case. The rest of your supposed bad players "who Ozzie liked" were forced into a larger role because Anderson couldn't cut it.
You can wail about this until you're blue in the face, but the fact is that Wise, Erstad, Mackowiak, Owens, etc. all were backups and bench players and since the club foolishly put their trust in the development of Brian Anderson, they had to take a bigger role when it turned out he couldn't hit big league pitching.