Does this prove David Vizard's 128 lsa formula ?

Sorry if I sound like a noob, but I'm getting confused because everyone is talking about LSA and DV's 128 formula is for the LCA(lobe centerline angel). I thought, but do correct me, that LSA and LCA are two different things. I thought the LCA is the centerline angle of the lobe timing or something like that. IDK help?