The recruitment in the summer of 2014/15, bar Stockdale, Baldcok and Teixeira was pretty poor (failing to land Assambalonga and get Stephen Ward back was the death knell ) and Hyppia was clearly out of his depth.
But he was dealt a pretty poor hand. Things might have been different if Dale...
http://www.dailymail.co.uk/sport/football/article-2883750/Sami-Hyypia-resigns-Brighton-Hove-Albion-boss-club-languishing-Championship-relegation-zone.html
"Sami Hyypia has resigned"