Yes, it is rgprice: viewtopic.php?f=3&t=7621#p117503rgprice didn't refer to any import from gMark and gJohn in[to] Marcion's gospels (sic).
I said "so-called preamble".Except several scholars propose and argue there was. Your next point suggests you think there was at least a ''preamable of gLuke''.
According to Hippolytus of Rome, in 'Refutation of all heresies', book VII, Basilides knew also about gMark, gMatthew and gJohn, and provided quotes from these gospels. See http://historical-jesus.info/gospels.html then "find" on: Basilides (120-140).
Also on the same book, Hippolytus wrote in Chapter XV "... all the events in our Lord's life occurred, according to them [Basilidians], in the same manner as they have been described in the Gospels."
So I don't see why Basilides would be ignorant about gLuke.
See evidence showing Marcion truncated and "updated" gLuke: http://historical-jesus.info/53.html
My arguments are below the testimonies of Irenaeus, Tertullian and Epiphanius.
Cordially, Bernard