Sounds like you're on the same page as me. As soon as I had the Maul 1:1 in my posession and could really see the potential for 1:1 busts, I started thinking about characters whose visual look I'd really enjoy at that scale and Grievous was in the top 5, and like you, as soon as we got the tease in that photo, I was on edge with every new announcement waiting for the one that'd be him, hoping it wouldn't die as a proto that never got approved. I believe Palpatine was announced after the tease, so that was kinda like, ok great it's someone else I really want, but where's Grievous, it worried me he might now happen.