If I moved Schwarber for Merrifield i wouldn’t sign Brantley, so for me it’s a moot point. But I would say the over/under on HR with either of those guys on HR is about 15 if they play a full season (which Merrifield is the better bet to).
To me, if you sign Brantley (which I would be very wary of based on age and health related imminent decline), you keep Kyle. If you did trade Kyle for Merrifield I think that would actually be a scenario where signing McCutcheon might make sense. But the big draw for Merrifield is that he can play legit and maybe even plus defense at both 2B and especially CF. Brantley is strictly a left fielder and at this stage, not even an especially good one.