Catcher: Rob Bowen
Funny enough, Michael Barrett was traded to the Padres a few weeks after the altercation with Zambrano, and Rob Bowen was included in that package.
There isn't much else to be said besides that.
Bowen's tenure in Chicago was incredibly short-lived—Not even lasting a month with the Cubs, Bowen recorded just two hits over 36 plate appearances before being designated for assignment and subsequently traded to the Athletics for Jason Kendall.
First Base: Derrek Lee
The most beloved first baseman in franchise history is most likely Anthony Rizzo, but let's not act like Derrek Lee doesn't have a spot high on that list.
Another centerpiece of the Cubs from the mid-late 2000s, Lee was nothing short of excellent in an All-Star 2007 season.
Slashing a .317/.400/.513 and 132 wRC+ in his fourth season with the Cubs, Lee's 2007 season still wasn't even within his top two seasons as a Cub numbers-wise. With his tenure with the Cubs ending as a 22.3 fWAR first baseman, Lee finished in the top 10 of MVP voting twice, peaking at 3rd in 2005 behind Albert Pujols and Andruw Jones after posting his career high .335 average and 1.080 OPS that same year.