The starting pitcher market has been boiling atop the MLB hot stove the past few weeks. Just check out a list of the top 20 or so starters who have changed teams since the end of the 2019 season:

Gerrit Cole, Zack Wheeler, Corey Kluber, Madison Bumgarner, Dallas Keuchel, Cole Hamels, Wade Miley, Julio Teheran, Chase Anderson, Zach Davies, Tanner Roark, Gio Gonzalez, Brett Anderson, Jordan Lyles, Dylan Bundy, Kyle Gibson, Rick Porcello, Eric Lauer, Martin Perez, Kevin Gausman.

A few days ago, we did some estimates to create a snapshot of how wins have transferred around the majors so far this offseason. After this weekend's moves, which were headlined by the White Sox's signing of former Cy Young winner Keuchel to a three-year, $55 million deal, approximately 183 wins have changed hands this winter via trades or free agency. Of those, 36.5% are accounted for by starting pitchers.

There is still work to be done. Wannabe contenders like the Padres, Angels and Twins still need rotation help. On the free-agent market, lefty Hyun-Jin Ryu -- who finished second in NL Cy Young balloting last season -- is still out there. He's really the last pitcher from the top couple of tiers in free agency still on the market, holding out for a big, three- or four-year deal. The other top options -- think Homer Bailey, Ivan Nova, Rich Hill, Taijuan Walker et al -- are down-the-rotation value plays for the most part.

What do these things tells us? Well, when you've got a free-agent class nearly empty of impact starters who carry with them any degree of certainty, and you've got teams trying to compete that have rotation holes remaining, there is only one recourse. Well, there are two -- the Pacific Rim free-agent market often gets overlooked, though the top couple of options appear to have been snagged already. (That would be two pitchers out of Korea: Kwang Hyun Kim, who signed with the Cardinals, and Josh Lindblom, who signed with the Brewers.)

Basically, though, we're talking about trades. Expect the whisper mill on that front to get louder over the next few weeks. For now, while we wait to see where Ryu lands and which rumors gain traction, let's see how the rotations stack up.