While I can only assuming you're mostly joking (haven't been following closely enough this offseason to know), if you're going to sign Bellinger (or really any player of note), you may as well hold Robert and hope he's healthy and good. It's just money at this point and I'd be surprised if Sox got any notable prospects for him right now. But he's as high an upside $20M flyer as you could find in the league, so I'm holding (yet again).