Also, I'm ok with Happ and Soler for Archer. What i'm more curious about is who else is going. If it's Cease, De La Cruz, Clifton or Jose Albertos... I don't know. If it's Underwood, Pierce Johnson, Jake Stinnett or Ryan Williams I'm pretty fine. I don't think they can deal Hatch as it's not been a full year since he was drafted. Hudson I'm sort of iffy on. Rest of the top 30 arms are Rosario(fine with), Zastryzny(doubt they'd move him for depth reasons), Felix Pena(fine with), Jen-ho Tseng(fine with), Corey Black(fine with), Jose Paulino(iffy) and Bailey Clark who was also just drafted.
I'd be some what surprised if the pitcher being discussed wasn't on of the first 4 though. Underwood might also be realistic.
Edit: dug a bit more into this
According to this link you can sort of project surplus value on players. Soler was a bit more difficult as he only has 4 years of control left. So i just divided the 8.1 WAR they had for "Hitters #26-50" by 7 and then times 3 and then subtracted that from the $38.2M they had for hitters prospects in that range.
Given that, Happ and Soler have around $88.5 mil in surplus value.
In this article, fangraphs calculated Archer's surplus value at $128.5 mil. So, we're roughly $40 mil off. That ends up being around two 80-100 type hitting prospects. Underwood was the #77 prospect going into this season. He had a bit of a down year but think you can feasibly argue he'd be roughly worth one of those. Cease and De La Cruz are also likely similar in value.
From there you're still short. If they want Montero think you could argue something like Montero and a 15-40ish prospect in the cubs system. I'd be sort of ok with that though like I said I really don't wanna give up Cease or De La Cruz. If they could give up two other minor parts I'd be ok. For example, Szczur and Ryan Williams might provide them with cheap players they can readily plug in and might be more desirable than higher upside guys farther away.
Also for what it's worth,
this article , suggested Archer's value might be more like $114.9 mil. That would be around $26.5 mil in surplus value over happ/soler. In that scenario, something like Underwood and Montero might be "equal" value. Think the fangraphs case might be best case on Archer while the el birdos might be a touch low.