Good article on Dansby Swanson's impact on the team.
https://www.marqueesportsnetwork.com/dansby-swanson-has-been-exactly-what-the-cubs-paid-for/
Cubs leaders in bWAR are:
Hoerner 4.9
Swanson 4.7
Bellinger 4.2 (about 20 fewer games than Hoerner)
Happ 2.8
Hoerner leads Swanson because of Hoerner’s baserunning value.
Two 5 WAR players in your middle IF is pretty good. A really nice foundation.
What is lacking offensively—to get to next level— is another big thumper bat. Even if Bellinger is re-signed, for sake of discussion, that’s probably still going to be the case.
BA recently did a story about bat speed. Cubs trailers unsurprisingly were Madrigal and departed Barnhart. Madrigal’s bat just doesn’t fit very well at 3B. wRC+ of 84.