I don't think he's a super-ace, but Eno Saris ran a really good article today on the Athletic looking for comparables on lots of his data. Basically, he concluded that he thinks that based on stuff+, history, age, etc, that Yamamoto has everything you'd look for if you were scouting an ace, but with perhaps questions on durability and size.
"We can say with a tiny bit more certainty that he’s like a Gausman with Bassitt’s curve and Eflin’s command, which would be a dominant combination but also has not necessarily existed in one human being before.
Nobody knows what they’ll get for sure, but it’s clear that the underlying data suggests that his future MLB team is getting an ace and that the only question is how many innings they’ll get for their trouble."
I'd guess teams are excited about the combined stuff+age for Yamamoto. I'm guessing the AAV will still be in the high 20's and low 30's with some sort of a 10 year contract (with possibly an opt out after, say, 6?). But I also get why you'd be in that market. How many 25 year old aces hit the free market? If you're looking at the stuff+ data and the like, this is rare, one shot, for a team. Normally when we see aces hit the market, you get guys like Snell; already into their 30's. This is a free, money-only shot at grabbing someone who has half a decade before they hit 30 with ace-upside stuff. Even if he hits all-star level instead of bonafied Cy-Young, that's rare occurrence in the MLB. Take it when you get it, right?
There's real risk there too, he's a pitcher and a pretty diminutive one in terms of what we're used to seeing in terms of size. Maybe his stuff doesn't translate completely. But if you're a big market, there's always risk in arms, so if you can buy an ace for money...go for it. I'd really appreciate the Cubs being in on this one for these reasons; stuff wise he fits a need, age wise he fits a long term piece, and I just don't think you get many shots to just...buy a ready made potential ace. I also think they're more risk adverse than me and likely won't be. They seem to be pretty wary of these long term contracts.