Here is an exercise for the start Burton/Grace/Quinn all at the same time crowd.
Write down all our viable options at the five, and then all of our viable options at the four. If you're writing down people who have never played a college game before, are under 6'7", or 200 or fewer lbs, you are doing it wrong.
So now you've got Quinn/Grace for the 5, and Burton/Grace for the 4. This obviously lends itself to start Burton and Quinn, with Grace the backup for both of them.
Now go look up Grace's stats
by clicking this link and ask yourself why you wanted him stealing minutes from our numerous capable guards in the first place. Grace is a fine backup, but we have better options for starters.
Only way any of this changes is if Mooney lands a quality 4/5 in the portal, which doesn't look too likely at the moment.