O'Shea - Dunne was broken up because St LEdger was an adequate (if not superior) replacement for O'Shea at centre half, and it meant O'Shea could be moved to right back, where we were struggling for cover at the time, following Finnan's retirement. Foley was still untested at senior level, and Kelly had just transferred to Birmingham when Trapattoni took over after a difficult final season with Spurs.
The argument was not which was the stronger centre half pairing (Dunne - St Ledger VS Dunne - O'Shea), it was what was the best overall defensive unit (Dunne - St Ledger - O'Shea VS Dunne - O'Shea - AN Other)
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