Another factor with Wicks is mentioned in the article. He's still in the midst of honing his stuff at AAA. Even just optimizing things for this season, he's not going to be reliable in the short term as he's still adjusting to the AAA level. And even if he succeeds in the short term, he doesn't have enough innings left to fill in as a starter for the rest of the year (as OO just pointed out, he's already past his career high in IP).
I'd give Smyly at least this turn to see if he can get back on track and give Wicks another turn or two in AAA to stabilize things while controlling his innings there.