After Brahmins Saiva Vellalar(Saiva Pillai) is the highest caste which ranks in Kshatriya status.
Almost all Tamil Kings were Saiva Vellalars who followed Saiva Siddhanta.
Ettu Veetil Pillai and Travancore Pillai Community is just an Migration of Tamil speaking Saiva Pillai Pandyan Kingdom and Chera Kingdom.
Saiva vellala or Saiva Pillai is a Forward Caste according to both TN and KL Government.
Most of the rulers were from this caste.
Saiva Pillai or Saiva Vellalar is Kshatriya who migrated with Rishi Agastya during Treta Yug along with Brahmins.
Genes in Saiva Vellala Or Saiva Pillai community is north Indian Aryan Gene which is same in Brahmins.
All Non Vegetarian Pillai communities in TN are sutras. For respect many low caste added Pillai as their Surname. But they are fake.
Saiva Pillai is Aryan Kshatriya Forward Caste who are pure vegetarian.
Original Saiva Pillai/Saiva Vellala is Kshatriya.