The 50-year-old was a big fan of Morison last season, making him his first choice striker ahead of Billy Sharp, Mirco Antenucci, and Souleymane Doukara, even despite his lack of goals.
Despite featuring early on in pre-season this campaign for Leeds, Morison was sold to League One side Millwall by then boss Uwe Rosler.
Redfearn said: "I would have kept Steve. I don't think Steve was as much of a problem as people thought and I think we put him in a better place, more confident, more aware of himself.
"To play at Elland Road when people have made their minds up about you is a difficult place. In the end he started getting a goal or two. In a better set of circumstances he would have scored goals for us."
Morison scored only two goals in 26 appearances for Leeds last season, and took until the match against Charlton late in the season to net his first, but his ability at holding the ball up and aerial presence helped players like Alex Mowatt contribute from midfield, and he was not helped by a lack of wingers, which meant the Whites could not play to his strengths.
This season at Millwall, Morison has scored seven goals in 28 league games, and 10 in 36 in all competitions.