The Phillies held their second workout for pitchers and catchers Thursday morning, but it’s possible that the final piece of their starting rotation has yet to arrive. Several free-agent arms are available — including Jake Arrieta — and Phillies general manager Matt Klentak said he has been busier this spring than years prior because of the glut of free agents still unsigned. The Phillies have a rotation lined up with Aaron Nola, Jerad Eickhoff, Vince Velasquez, Nick Pivetta, and whoever wins the fifth-starter competition. The Phillies could certainly use another pitcher. “We’re open to adding a starter if it makes sense for us, but even if we don’t, we are confident that this starting pitching group is going to take a step forward because they are really talented and they’re healthy,” Klentak said. “We’re watching them now, and they look great. The starting pitching market being as slow to develop as it has has allowed us to get to Clearwater and watch our guys and evaluate them and see the look in their eye and see the electricity in their pitches and regain that confidence in our young starting pitching.”