I'm not sure it really needs much else. If you're running more of a balanced team, Reflect Type is reliable as hell, and it serves its purpose in beating the mons it does and absorbing status. Analytic LO hits hard, isn't spin blocked by the relevant Ghost-types, meaning it isn't a momentum drain like Driller is outside of Sand (Drill has to predict Gar on the switch, and is pretty cockblocked by Mega Sableye), making it a great choice for offence if you need hazard control.
That brings me on the the part about Starmie vs. Drill as choices for spinning. I'd say Starmie isn't just arguably better, I'd say it is pretty much unequivocally better when compared to non-Sand Rush. The speed of Starmie is really appreciated, and really, I'd rather go without hazard control or just throw on a Lati than use ScarfDrill (idk why this is still a set).
As far as coverage goes for offensive LO, Hydro and Psyshock are mandatory, of course, but I can't see much point in using Thunderbolt, seeing as Psyshock and Hydro cover many of the targets of it, though I guess hitting Manaphy, Slowbro, and Gyara/Mega Gyara for more damage could be pretty sweet. About Grass Knot, I'm not too sure about that, tbh, I haven't given it much thought and it kinda slipped my mind. HP Fire is pretty good for getting past Ferro, as being walled by that is never fun. The targets for Ice Beam are obvious and it's always handy to have Ice coverage. Dazzling Gleam is terrible imo, kinda like Dazzling Gleam Gengar.
(Sorry if I forgot a few things and this post is slightly, if not completely nonsensical I'm tired as hell lol)