In general, most National League clubs use a 7-man bullpen and a 5-man bench, allowing for a backup catcher and four position players to (in theory) serve as an alternative for every position on the field. The ideal scenario is to have versatile bench players who offer a unique skill, such as power, speed, or superior defensive abilities. The St. Louis Cardinals, however, have often employed an 8-man bullpen under manager Mike Matheny.
When it comes to assessing the pros and cons of an 8-man bullpen, it’s important to consider personnel, specifically on the durability of the pitching staff, the number of minor league “options” possessed by pitchers AND position players, and the ways in which the manager takes advantage of the “extra” pitcher.