Orr, who took temporary charge following the sacking of Ian Millward two months into the season, was asked for his views on the short-listed candidates and he was happy to endorse the choice of Castleford chief executive Steve Gill.
"I gave my opinion of what those coaches would bring," Orr said.
"Obviously with Daryl, we've got a guy with a wealth of experience who knows the game inside out and has played at the highest level.
"For what the club require, Daryl is going to be a fantastic appointment. He's the right man for the job - he knows the area and he knows the kind of club we are."
Orr, the club's former captain who only joined the coaching staff after hanging up his boots at the end of last season, guided the Tigers to consecutive home wins to ensure the new man would not inherit a team at the bottom of Super League.
But for conceding a late interception try at Salford, Orr would have enjoyed a 100% record in Super League, but he always maintained that he was not yet ready to take on the role of head coach and he is more than happy to continue his apprenticeship under Powell.
"I'm reasonably pleased but we should have won at Salford," he said. "That still hurts me but two out of three isn't bad. I'll take that.
"I always said it was only a temporary role, for however long it lasted, and I'm happy to hand the reins over to someone who is obviously a lot more experienced than myself and who knows what he's doing. I'll be glad to assist now.
"We've already had a good chat and I'm sure we can establish a good working relationship. Speaking to him, he's got really good ideas on how the club can grow."