"To me, that is all he needs. A supply of black goo and juggernauts"
I think it Depends on WHAT you mean by Outposts/Colonies.....
If the Engineers Return to Discover what has Happened on Planet 4 then they SURELY would be UPSET... to say the Least.... HOW do they know who is Responsible would DEPEND on them being able to Determine if those Human Bodies on Planet 4 (Covenant Crew) are from Earth? Thats Easy if the Earth is the ONLY Place the Engineers had Seeded Humans.
Or do they GO OUT and Destroy Every Creation they have Made? To be on the Safe Side, or just GO and LOOK for wherever Mankind from Earth has Colonized and Attempt to BRING HELL to us all?
If you are talking about David being the ONE who wishes to get a Engineer Ship and then UNLEASH HELL on every Human Outpost/Colony or/and the Engineers, then its WHERE does David get the Engineer Ship from?
"That'd be cool. Could be Daniels?"
He had INDICATED that all he Needed to Perfect was his Queen, and he did say to Daniels he was going to do the SAME thing with her as he DID to Dr Shaw. Now some think that means ATTEMPT to Rape Her then Kill Her!
However David had WANTED to Offer Dr Shaw a Chance to Create a New Eden and to Evolve her, and by his Drawings which could be his Fantasies/Dreams and Ambition we do see Various Drawings of Dr Shaw being Mutated into a Hybrid or also being USED to Birth his Creations.
But all of this Speculation maybe is Suited to its OWN TOPIC ;)