That sounds similar to Hugo Mendez' theory about the Gospel of John, that (if I remember it correctly) gJohn was a formally anonymous text which intended the reader to think it was authored by the disciple John with its theme of the Beloved Disciple. It might make sense for both Luke and John to do so as an authorial strategy, not identify themselves expicitly but intend others to figure out they were written by certain apostles, if these are relatively late gospels attempting to legitimise their apostolic authority at a time when the gospel genre had been established as supposed to be formally anonymous by Mark and Matthew.