I think the biggest issue with murph is his role - watching Carlton games it doesn't seem like he's been in many centre bounce setups and his season heatmap thus far shows it.
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Comparing that to last season:
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I'm not sure exactly why he's not attending as many centre bounces, but if his current role continues I don't think he'll average enough to be a keeper. No doubt he'll be value, but I don't want to be stuck with a bloke averaging 100 odd when there's plenty of 110+ options floating around in the midfield. Unless there's plans to eventually get him to the pine as cover (seems way too early to be doing that) then I'd pass on him unless we see a change in role.