Yes you're right i think a case of 2+2 = 5 because earlier posts obviously weren't read even if you drip on an RDTA it doesn't become an RDA it still remains an RDTA because it has the tank below so you were correct from the beginning and it was never marketed as an RDTA, RDA, RTA combo has suggested earlier in the thread.
Anyway back on topic i keep it simple and use Kanthal or SS when using with Replay.