Recently upgraded to Kubuntu 15.10 and not immediately, but soon after, Akregator now runs alone outside of Kontacts panels only, and it does not appear in the plugin list for the Summary Selection when configuring korganizer.

Some how Akregator has popped out of my preferred place. How do i pop it back in?

What version of PIM are you using? Post both kontact and akregator. Ensure you're also fully up to date: Kontact may not be able to load Akregator due to things like version mismatches.

I'm using Kontact 4:15.08.2 and Akregator has the same number listed in Muon Discover.

Ensure that akgregator is not running (somehow) before you start Kontact as well. If it's not a mismatch, this usually occurs when one of the applications is still running.

I quit all instances of anything in Kontact and rebooted. I think I had a redundancy conflict between saved sesssions and instances running. All good.