Maybe I'm mistaken, but Clarence Lewis, who had a pretty good freshman year as a field cornerback, looked like he was playing out of position last year as the boundary cornerback.
It reminds me of what happened in 2004, when we stuck Mike Richardson at the boundary spot, and he got badly toasted. Once we shifted him to the field cornerback spot in 2005, he did a fine job, and became one of the better cornerbacks that ND has seen.
I would say let Cam Hart play the boundary position, since he works better in those high stress, press situations, and let Lewis play the field, where he has time to make adjustments. If he can't play at least as well as he did in 2020, then it would definitely be time to let one of the younger guys jump in.