They were humiliated at Twickenham by Cardiff Blues in the EDF Energy Cup final in April and failed to make the Guinness Premiership play-offs for the first time in four years.
A run of four successive league defeats at the end of the season culminated in a sixth-placed finish and it is eight years since they have finished lower in the table.
Following the 50-12 humbling by the Blues, Ryan questioned the ability and potential of his squad, which included 25 players with international experience, and said it would need an overhaul after a third season of underachievement.
Gloucester had finished top of the Premiership on 2006/07 and 2007/08, but on each occasion failed to convert their form into silverware coming unstuck in the play-offs to Leicester.
As a result Ryan began his overhaul of the playing staff and there have been more than a dozen comings and goings at Kingsholm since the loss to Blues, which Gloucester legend Mike Teague described as "embarrassing".
But it will instead be the 37-year-old Redpath who will get to work with the likes of Wales fly-half Nicky Robinson and new backs Seru Rabeni and Tom Voyce, although Walkinshaw said any more big-name arrivals were unlikely.
Walkinshaw's analysis of the club highlighted the failure to bring in extra support for Ryan when he replaced Nigel Melville as director of rugby in May 2005.
"When Dean Ryan was promoted from head coach to director of rugby we didn't follow through and replace him so Dean was caught between the two roles," Walkinshaw added.
"The lack of a head coach has been the biggest contributing factor to the inconsistent performance of the team on the pitch.
"One week we could beat almost anyone, the next week we couldn't beat a carpet.
"It was terrible, we made a mistake in not following through and appointing a head coach to replace Dean when he moved up.
"We did consider bringing in a new coach from outside but we're looking at evolution and not revolution and feel that Bryan is absolutely the right man for the job.
"It's up to Bryan now to stamp his style and his authority on the players to get them to play the way that he determines will be successful.
"The expectation every year is to qualify for the top four in the league. That's the first thing we've got to do, the Premiership's the number one competition.
"And then we need to try and aim for the last eight in the Heineken Cup and obviously do as well as we can in both competitions, and ideally win both.
"We're focused on a big achievement in the league and we're nearly there. It's only delivering the last little bit that we've been lacking for the last couple of years or so."
Redpath will be assisted by present coaches Carl Hogg and Denis Betts, while a new director of rugby is likely to be appointed at a later date in the season.
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