@drill The ones in the right field (middle in this photo) looked large to me, but I'm also a terrible judge at size so take that as you will! I couldn't tell what was in the left field, that might be the tommies you mentioned.
In the back are Addra gazelle, not Thomson, and it looks like an Eland as well even further back. There could be Thomson right behind the Gemsbok, but hard to see on this picture.
@lintworm I think the Thomson's might have been to the left, you can't really see that area in this photo. There seemed to be a yard next to the gemsbok but I couldn't see any animals in it.