The camp, run by a company called Collective Minds, involved mental tasks that reportedly made many players feel uneasy and played a role in the early retirement of Curtly Hampton halfway through the 2018 season.
“It has kind of hurt the boys, the culture of the club,” Ellis-Yolmen told AFL Trade Radio.
“It divided us and stopped us playing good team footy that we were playing in that 2017 year when we made the grand final.”
Since their 2017 grand final loss to Richmond, and since the camp took place, the Crows have been lacklustre, failing to make the finals both years and winning just half their games (22-22).
Ellis-Yolmen is part of a mass exodus in Adelaide, with nine players linked to other clubs or asking to leave.
While in Adelaide, Ellis-Yolmen leman played just 39 games in eight seasons.