The reality is that Sale could provide the Red Sox 24 WAR for about $40M plus should get a comp pick if/when he leaves. That’s a good $150M in surplus value.
Having said that, if Moncada & Kopech are both 4 WAR players over the course of their period of control, we’re talking about nearly 50 WAR in return. And no one should be surprised if one of them becomes an absolute stud and blows that projection out of the water. That doesn’t even include Basabe, who has a chance to be a pretty good player himself. I would say as things stands right now, we’ll likely end up with significantly more value than the Red Sox. That doesn’t mean the trade was lopsided necessarily, but hopefully we can consider it a sure fire win from our perspective.