Hard to see Romani jumping to the A next season based on what I've seen. That said, he is still getting his legs under him so I might be speaking to early on that.
I could see Eliasson heading there though, he has the size and the skating ability. If the colts look like they're going to be strong, I could see the Sens sending him back to try and make a run at it though.
Agree with above, Hemming could really use the extra year in Jr. to work on the offensive side of his game. He won't get that opportunity if he goes to the A next season.
Selfishly I hope to see at least Romani, Tiller & Gardiner back. Tiller has been coming into his own this season with more Ice, I think he could be a strong OA but agree he might be upgraded. Gardiner has been hot and cold but he has shown some pretty good goal scoring prowess lately. If they don't get Romani back they have essentially traded Vaughan away for no reason in my opinion. Van Steensel is good but Wigle is just as servicable a player. Romani hasn't gotten his legs under him yet and hasn't been impactful.