This actually didn’t work out as I hoped– overriding that specific line disabled the circle effect, disabling others eliminated the hover and left the circle, but still left some odd handling of different sized images.

I wound up using a child theme, copying our_team_widget.php into functions.php, and editing it to define a new widget with a different name and a different class for the image (matching the definition in the free version of integral). I then used the new widget instead of the original team member widget, which leaves the hover effect intact for other parts of the theme.

It might be nice to be able to toggle the hover effect in future releases– I personally think that the look is a lot cleaner without the hover for team members, but this is subjective.