Asañña satta has a hadaya vatthu.
– However, “mananca paticca dhammeca uppajjati mano vinananam” cannot take place because that is prevented by kammic energy for an asañña satta.
– So, the mind is effectively inactive, i.e., no citta can arise.
Ekaja kaya is the first kaya (kammaja kaya) that arises at cuti-patisandhi. For an asañña satta that is the only kaya that can arise, since no citta can arise (no cittaja kaya, and hence no utuja kaya either).
I don’t see those formatting buttons either. Will try to see what the problem is.