Well, the last line is pretty unfair and pretty unfounded; if you'd go back to my original point, it's that I can buy an argument for either buying or selling. As in; if the Cubs want to keep Marcus Stroman, and if they want to keep Cody Bellinger, that they should highly consider surrounding them with a more complete team. I'd be for the Cubs spending prospect capital on controllable players, or quality rentals (emphasis on quality). What I don't want the Cubs to do is to say "well we kind of tried!" bring in a "raise the floor 1b" and then be done. That's rife for the worst case outcome of threading needles.
If you want to make a logical answer for trading Stroman and Bellinger, the answer is this just isn't a very good team. It's a team that's flying high today, but as stated, things are never as good as they feel at the apex, and they're never as bad when you're in the valley of death. The Cubs have had to go on a 7 game win streak to get to .500. Yes, the RD is really nice, but I'm a little skeptical about the RD a bit; they're quite reliant on BABIP-god offense (5th best BABIP in the league while being 20th in ISO) and at some point that BABIP-luck may dry up (league BABIP is .20 points lower than the Cubs). Pitching wise, their BP is bottom 10 in xFIP, and the Cubs are pretty top-heavy in the rotation. Steele and Stroman are doing a ton of work. Kyle Hendricks (3.45 era vs 4.53 xFIP) and Drew Smyly (4.57 xFIP) are pretty sketchy moving forward, and Jameson Taillon is a questionmark (his xFIP is lower than the ERA, but has a horrid habit for leaving pitches down the zone, so he's earning his HR/FB% right now. Is that fixable)? That's not a team that fills you with a ton of encouragement, regardless of the division. There's major holes here. On top of that, you're looking at a 30% chance to make the playoffs. Is that high enough for you today to say "Well it's worth it to get nothing for Stroman if we don't make it". Because the return there an be quite useful; it's ammo for a trade in the offseason, etc...On top of that, you've got reports that the Cubs are worrying about going over the luxury tax this summer. That doesn't sound like what teams committed to winning say. Lastly, the market right now is extremely foggy. Giolito just went for a great return and I'm not sure what else is definitively out there. Is Snell available? Outside of him, then who? Maybe Verlander? If someone wants the money on the hook. Who's buying? And how desperate are they? These are questions I can't answer, I'm not in those rooms, but if it's a seller's market...well the Cubs have pieces. Really good ones.
I don't want anyone to think I'm prospect hording. I'm entirely pro-the-Cubs acting like the Chicago Cubs and going and winning the damn division. But I'm also going to understand there's a flip side here, and there's an argument that can be made that trading their players now, could pay off too. Would it suck? Yeah, sure, for now. I'm enjoying watching the Cubs win baseball games, it's fun. But I'm not here to just watch the Cubs be okay-ish, either. The Cubs need to nail this deadline, IMO, I just think it's not as clear cut as "Well our division sucks so stay the course". Sometimes hard decisions today pay off greatly tomorrow. I can truly say I don't know what the "right" answer is here. Only that I can see a flip side where the hard thing today pays off.