So, if you take the Tesla Twin Mech, put two RTA decks on it, you can join them with one coil and vape a twin single coil dual deck mech mtl rta/rda thingamabob.... problem solved...
I think there is some innovation (if you're referring to the new Tauren deck in the first pic of your post).
Thunderhead Creations have what they call a "stepless airflow control", which is a simple linear air control ... not sure that anyone would ever require that level of, (unrepeatable) control tho'?
I agree that the rest of the design has been around for a while, including the bottom air flow through / around the 510 center pin, the replaceable centre air flow jet, whether it be threaded, o-ringed, knurled, slotted or smooth, single or multiple hole(s) or slots, coil placement and attachment, wicking arrangements, etc. etc.
As to pic2 and 3 ... erm ... I'll pass on any potential innovation there ... I'm a Standard Grade Pupil dammit