These empowerment's I am talking about are from Longchenpa. I received them as a part of the Dam Ngakdzo. They are not like ordinary empowerment's at all, but they got a mandala. I think you will have a very difficult time proving that these empowerment's are a synthesis of Mahayoga and Atiyoga. In that case the ripgpai-tsal-wang that ChNNR gives, at least the few I received, contain more Mahayoga influences. Anyway, it doesn't really matter I think, it is all theory.
Well same goes for Nyingma Kama, except for semde wang which is more in the style of ati than anything else given these days. Longchenpa was also a part of tradition that was being handed down for some centuries already, when he lived.
If you received Yeshe Zangthal introduction from NNR, then that is purely atiyoga style.
True this is all just a theory, since in practical sense all is applied as you mentioned above. In any case my argument in the beginning was that the path of mahayoga drol lam and atiyoga mengagde are two different things. Looking back at this whole thread, it is indeed a manifestation of namtog (as are most of the other threads, he on dharmawheel
My personal opinion about the inner tantras is that their root is Ati and then Anu and Mahayoga as well as the many various Ati methods developed from that. Many western scholars seem to think that Anu and Ati developed from Mahayoga but that makes no sense to me. No, I haven't received the Yeshe Zangtal from ChNNR but since I am not particularly searching for a pure Ati style, it is enough for me if I actually get what I am receiving. Direct introduction, no matter the package, is always completely pure for me.