Had forgotten Torreyes was COVID. I don't see them moving on from Herrera while Harper is banged up and Joyce and Quinn are on the shelf.
My guess is Segura will be activated as soon as today and Romero will be optioned.
Then like you said, fairly soon, they will either have to designate Torreyes or recall him from his rehab and designate someone, but who? Hale?, Kintzler? With Maton hitting keeping Torreyes is not as important as it was a few weeks ago, but I bet we see Kingery optioned and someone designated in favor of Torreyes.
After that Bradley, Quinn and Joyce will be ready for rehab and then activated in favor of Hale/Romero/Kingery/Moniak/DLS is my guesses
Who knows DD could be actively working on a trade for a 5th starter or centerfielder or bullpen upgrade.