....for the berth of Cybertron and the Transformers species, where does the Allspark fit in? There hasn't been any mention of it at all. (Apologies if this has already been queried)
It's theorized that the Creators built the bodies and used the Allspark to give life or they were mindless drones and the Allspark gave them life on it's own.We might find out in the next sequel about it.Meanwhile,this might help Movie timeline - Transformers Wiki
The Creators built the AllSpark out of transformium from other cyberformed worlds, then used it to create Cybertron and the original 13 Primes, they claim it as their own, the Creators were exorcised and just the legend remained 'the Creators' and all the new cybertronians knew only about the AllSpark
It never said they created Cybertron, the seeds, or those ships either, just shot the seeds and collected the metal to make Transformers. Lockdown said it was a collector's ship he was using but he never technically said they built it, just that it was theirs. So, the Allspark could have had no connection to the creators at all.
I wouldn't use the TFwiki movie timeline as it has film series non-canon IDW comics included. In the movie prologue Optimus said they do not know where the Allspark came from only it has the power to create worlds and fill them with life. It is how Transformers were created. Given what Optimus and Hound said of cyberformed worlds and Transformium used to create their bodies my guess Transformers were originally just technology of the Creators. But along the line the Allspark came up and gave them life. Its a dual origin story like Quintessons and Vector Sigma in the G1 cartoon.