Fringe, Observers and pseudo Engineers from Alien: Covenant...
Any relation between the two?
Engineers are just advanced humans, with a bit older but still identical genome.
Perheaps these guys are also humans? (Observers in Fringe are humans from the future,
with alterated genome). I have a feeling David destroyed the wrong guys. Why did he destroy them in
the first place, that is still not completely clear to me.
Strong possibility: These guys are the children of Engineers, just like humans. What we see is the early stage of created civilisation. Why is there only one ship, because that ship is not theirs but of their visitors/creators/tutors. Remember how Engineers visited Earth and early human civilisations...
Every inconsistencies and illogical things can always be explained, because those thing are not inconsistent and illogical at all, only our preception is
EDIT: Another interesting thing is of cource our translation of "Engineer script" from paradise structures:http://www.avpgalaxy.net/forum/index.php?topic=54532.0"From our death, our children will rise."