To quote myself... "in the future". I think by the time you consider platooning Rizzo would be during a serious playoff run. It wouldn't be a strict platoon, since by then, management would know which lefties Rizzo has had success against. It seems more likely that Bryant and Olt (hopefully) are going to be in the big leagues soon, and both are corner IF types that crush LHP, that they would be the candidates and not McCann if we were to acquire him. No reason to play Rizzo if you have a surplus of lefty mashers and a logjam in the IF. Since the break, Rizzo is batting .210/.313/.410 and a .321wOBA. He needs to wake up.
Castillo has had a good stretch of games, but still no power and .159 w/RISP in 84 PA, and .211 w/Runners On in 135 PA. McCann has 9 solo shots, 8 HR w/Runners On and 4 of those w/RISP. He sports a .224 w/RISP and .248 w/Runners On. .272/.351/.514 on the year - that's what the Cubs need. That's the kind of production we need to expect from Lake as well (while I'm thinking about it).