Here we have the latest batch. They’re just starting to spread out and really start to blossom. They’re approaching the status of a type one civilization.
As per your specification we’ve isolated their galaxy in a full spectrum distortion. They can’t observe any artificial activity and think they’re all alone. They won’t be influenced by any external forces.
I figure we should give them another ten thousand years or so to finish developing. By then they should have flourished into a fully realized galactic force, free from outside contact.
I know how much tastier you find a free range species.