The Didact the is introduced in Halo 4 is the Ur Didact. He is the same didact that is shown shown in the terminals before and during the Human-forerunner wars. He is the same on and matches the size description of the Ur Didact in Cryptum. He is much too large to be Bornstellar. Bornstellar is a builder with a warrior servant imprint(Didact) while the Ur Didact is a warrior servant with a warrior servant imprint. If it was the Bornstellar Didact in Halo 4, he should have looked much different than the Ur Didact in the terminals.
[Edited on 11.29.2012 6:13 PM PST]
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[quote][b]Posted by:[/b] TacoBellSpartan But wasn't the Ur Didact executed by the Master Builder in Cryptum also?[/quote]according to the description of silentium the Ur Didact was actually left for dead on a flood-infested world.