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I agree with you about choosing one young gun to start in April. But...look carefully at our rotation. If you pick just one young pitcher to try in the regular season, you are still short one starter. Felix, Iwakuma (who may not pitch the full season), Ramirez, ??????, young kid. The ????? would currently be filled with Blake Beavan. That will not be fun in the smaller ballpark.
Marcum gets grounders and Ks, pitches deep into games as long as he's healthy and you don't have to sign him uber-long-term. It's a no-brainer.