Mate I'll weigh in here, not that I aim to change your opinion, but ...
Really don't see why you think Walker is such a bad defender? Statistically he has been better over many years than all of our outside backs including Parker. He's aggressive, and has great line speed, rarely misses, and more often than not has come out on top of his opposite number. He was one of the best right-side centres in the game for a few years, and, if you recall the first part of 2019, he was dynamite at 6 - a big reason why Manly had a great start to the season (before he got injured).
Walker is an experienced Premiership-winner with definite x-factor, who has always given it his all, no matter where he is asked to play. I completely understand why some would want him out of the club, but let's be honest here, the reason being his off-field behaviour, and the general image that the club is associated with. Fair enough. It is certainly not for his on-field performances. I like that Des has got him covering Chez's position. Foz to straighten our attack and direct the team around with his kicking, and Walks as a running, and unpredictable right-side playmaker (very similar to Chez's best attributes - minus his kicking game. Although Walks is not too bad a kicker either)
Go Manly