> Diadectids [...]
They might be Amniota(= Reptilia)after all.
Add enough taxa into the matrix and that's how they pop out. Close to Procolophonids, Pareiasaurs, Lanthanosuchids, Solendonsaurus, etc. etc. I wish the truth were more like the textbooks and experts say. But when you test it, it's not.
Do the test yourself.
I will, as part of my thesis. See you again in 2 or 3 years...
Any characters or character coding will do.