Yeah I'm fine with playing Shatty because he brings some useful offensive skill to a team that doesn't get a whole lot of drive from its back end. But he needs to be sheltered in terms of his purely defensive workload and minutes. It's easier to do that when Gryz isn't there.
To me, McAvoy, Carlo and Lindholm are the locks, Peeke and Wotherspoon, and Forbort when/if he's fully healthy, are your depth grit. Only one of Shatty and Gryz should then fill out the 6 in any one game to add some transition and puck moving talent. Lohrei's a little bit harder to pin down as to his exact role, but he's in the mix depending on how the rest shapes up.