I think Mcknight needs to be on the field for 1rst down and/or 2nd down. So if you want to start him fine, but they will all rotate.
Besides from being more explosive than the other two, there is a running and passing threat with him in there. Why make him block, that's why Connor is in there. He should be buring LB's on a pass, in a mis match all day until they adjust. For any offense, 1rst down is key.