Arakune should move up slightly, He still has the crappiest normals in the game for the most part, but having 7~11(!)k+ loops off of random crossup hit durning curse makes up for it. I think Arakune with all being that being said is probibly gonna scrape the Bottom of B-tier for the remainder of CS due to having crappy normals.
Lambda I think should stay mid-high B tier. Lam has good normals and mindgames (and breaks lots of primers)