Nice response.
I've also been a huge Marco supporter since we traded for him.
I wanted him to play 3B last year instead of Shaw and Holt.
The issue this year goes beyond keeping epth due to options, which itself is a strong argument to keep Rutledge in the mix. I have long been a doubter of Pablo's ability to hit LHPs ever again. I think he should be platooned immediately. While Marco's splits are not wide, I think Rutledge is probably equal or better than Marco vs lefties. Maarco might have a better glove but worse 3B arm. I think they are pretty even when a lefty is pitching. That's the point that tips the balance to giving Marco full time playing at AAA to start the year. Any injury to Bogey, Pablo or Pedey would man an immediate call-up and FT job for Marco. If Pablo struggles vs RHPs too, then I'd think of replacing him with Marco.
I apologize for implying your decision was based on just (or primarily) ST'ing numbers. Others here seems to be basing it on that, because besides a handful of posters, there was little love for Marco before this spring.