Honestly for me it's the other way, I think Walker's analysis has always been weak and his trend has been towards staid cobweb leftism resting on old radical laurels. Sarkar at least has a bit more thinking process going on, and Bastani is having an identity crisis because he likes to think of himself as intellectually probing, but actually has a hint of the Rogan in his willingness to suck up and regurgitate bad ideas without much in the way of pushback (his recent interview with Paul Morland being a particular example). I wouldn't be in the least bit surprised if he breaks right at some point, he definitely has a traditionalist streak. They're very much missing James Butler imv, he was easily their most thoughtful contributor (presumably why the LRB nabbed him).
Collectively Novara's biggest problem is they largely rejected radicalism to pick up with Corbynism and have had no idea what to do with themselves since then, other than chug along with a sort of Young Turks style commentary/interview output aimed at a general "leftie respectability" angle. Which is fine in its way but not a lot of point in looking to them for a direction, as they don't reallly have one.