I don't know what to say without seeing him, but I doubt he is protected. And even if he is picked, I doubt he would stick for the entire year. That said, if he really has turned some corners, then there is room. It may be at the expense of another prospect, though.
It is in the last 30 seconds of this 50-minute podcast, but FWIW they had the Hartford (Rockies AA) play by play guy as a guest Nevin expert, and skimming Vavra at the end he said he thought Vavra would have had a good chance to make the Yard Goats this year (i.e., do the Low-A to AA double bump in 2020).
The other Nevin nuggets were August 2019 Eastern League Player of the Month, and giving the near 1B only 2019 positional context as in part being driven by having Colton Welker as a teammate.
Nice to hear the tidbits on Baumler from the Instructional League. I know folks are going to point out the nature of what is reported is overwhelmingly positive, and they are right, of course. Still, this last draft was performed with heavy analytics and without in person or in competition video for the spring 2020 season in college and HS baseball and without in-person workouts. IMO, the positive comments are an early vindication of our draft strategy and the two HS prospects we invested big $ in with the expectation that they were essentially second or third round talents. The early word from various quotes from Matt Blood is that Mayo and Baumler are who we thought/hoped they were or better.