2. 3B Alex Bregman
Although Christopher Morel appears to be vying for a more permanent role at the hot corner, the Cubs could just say "screw it" and sign one of the best third basemen in the game. A former second-overall draft pick, Bregman has been a rock in the Houston Astros' lineup since 2017. He checks all the boxes too, playing solid defense, posting high on-base percentages (.373 career), decent power, and a lot of postseason experience.
Although his power numbers have regressed a bit in recent years, Bregman is still one of the best hitters in the game and he would be a clear answer at third base for the rest of the Cubs' current playoff window. Bregman is also the best third baseman set to hit free agency by far. If Morel doesn't pan out and the Cubs don't develop or trade for a third baseman, Bregman is the best option money can buy.