I'd say any of Riske/Betancourt/Howry. I don't think they've said who though. Betancourt is their best RP so he'd probably have the most success as closer, but if he isn't given the job he can't get any saves. As for Wickman losing the job... he's not very good so I could easily see it happening. His only good season was 2001.
"Jack, will you call me, if you're able?"
"I've got your phone number written, in the back of my Bible."