I haven't looked but you're probably right that there may have been 4 possibilites.
I actually thought of 3 but 1 of them was ruled out by my starter words. So, I just focused on the remaining 2 that occurred to me and did not try to find any other options because, as I think I mentioned before, that just makes the choice all that more difficult.
As for the obscure vs common, I agree that it will not always work but it has recently worked (more often than not) for me and I'm going to stick w/the trend until the pattern is broken.
PS: I use the same 2 starter words in every game which are shown in every pic of every board that I've played/posted, so there's no need for you to guess which words those are.