Well, considering Ady's prequels will be OTish, Adywan could put some elements of HIS prequels into ROTJ:R without betraying himself, couldn't he?

For instance, I read he's willing to replace the imperial shuttle in which Han flies to Endor with another shuttle. We know from the movie things like the shuttle calls the attention of the imperial officer by some reason, and that it has "an old security code" by the time of ROTJ.

Now suppose Ady finds, or designs, or inserts in PT:R some ship meant to be a Republic shuttle, then he could use it again in ROTJ:R as the old ship the rebels use to infiltrate...