Gartside has no doubts about Coyle's managerial ability.
"It has been a human story and it's what Owen is," he told the Bolton News.
"If he was the best kept secret before, he isn't now.
"It has been about the passion for his job, the passion for his faith and the passion for his family - and that's his own personal family but one that extends to his players.
"He works with them day in, day out, and he treats them exactly like his own."