I think Matt Chapman is a perfect example of "Good player, Wrong Player" for the Cubs. There's a team out there that needs a glove-over-bat projected infielder for the next few years, but the Cubs aren't that team, with Hoerner and Swanson already locked in over the next few seasons, both of whom project as glove-over-bat types. Even with funky data last year that I can't entirely make heads or tails of, Chapman has been a 110 wRC+ over his last 1,800 PAs. What the Cubs lack are upside bats that provide run creation opportunities. With the previous infielders already mentioned, with Happ and Suzuki locked in, without an obvious plus-hitting catcher, and with PCA who's bat is a bit iffier than his glove, the Cubs just don't have a ton of opportunities on the team to add that kind of bat...third base remains one of the few chances they have. There may be opportunities for the Cubs to make an approach change to switch that projection, but that seems like a pretty hefty bet for someone with as much data as Chapman already has. I'd rather the Cubs not try to sign a Chapman to a six year deal hoping they can make him into a hitter that fits their needs, instead, just finding someone who already does.
And so, while I think Chapman provides value, he doesn't provide the diversification the Cubs need. A different infield and a different offensive team and he'd make a ton of sense. For this team, I'd much prefer if someone else signed him for the next six years.