Maybe they want to use Plummer simultaneously as a 3rd OH/2nd OPP, because they spent a lot to keep Egonu? Courtney-Plummer duo may definitely work, but it will be the end of fast setting system of Imoco, and tbh I don't want to see that. And I don't believe those rumors fully, because in this scenario (Sylla-Courtney-Plummer trio), Imoco would be so dependent on Courtney, and let's be honest, she's nowhere near being good enough to make a team on a level of Imoco dependent on her. Imagine Courtney getting injured and Imoco playing with Sylla-Plummer duo, lol. It's really hard to imagine that there won't be a 4th, really solid OH in this scenario.
No matter what, we'll find out about all of those moves really soon.