http://www.rigpawiki.org/index.php?title=MahamudraIn the bone yard wrote: Dharma friends,
I would like to see these references where Mahamudra is supposed to be highest tantra.
Would you gentlemen please direct me?
You can see that Jamgon Kongtrul the great equalize Mahamurda with Dzogchen Semde. But perhaps this is what you mean with "lower tantra" you only practice Yangti?
In the Nyingma terma tradition Mahamudra is sometimes related to the completion stage of Mahayoga or Anuyoga but even so Mahayoga and Anuyoga is not lower Tantra.