I think Walker has been "all potential, little substance". While he is the best centre we have I would not be heartbroken to see him go.
How DESpicable would overcome our lack of backs would be interesting, but not insurmountable.
We could play a 'power forward' style, using Tafua and Suli as pseudo forwards, taking plenty of hit-ups and keeping our other forwards fresher.
We'd have no attack in the outside backs, except for cameos by Turbo. But as long as our three-quarters were strong defensively I could see us winning plenty of matches by over powering our opposition.
It would be anathema to the traditional style of Manly backline brilliance, which we didn't see in 2018. We'd have to reply on our power forwards scoring most of the tries, but this was the case last season anyway.
Bashing the opposition into submission. It seems like the best option we have until we unearth some three-quarters with pace, skill and flair.