Of course there are over a dozen. They have to able to pick which one that gives them the date they want.
In a previous post, I surmised that the dating had not been done. That guess appears to be correct in relation to direct dating of the fossil or the matrix. The "tentative" dating has been inferred from other fossils.
Can we say anything about how this creature might have lived?
Toumai was found with a wide range of other animal fossils - the excavation site has thrown up more than 700 specimens, including fish, crocodiles and rodents. Not only have these been used to date Toumai, they have also helped to open a window on the local environment 6-7 million years ago. They suggest Toumai lived in an area with a diverse range of habitats, which included lush forest and a lake.