Inserting Bags or Holmes into the starting lineup would be suicide. Both are ball stoppers. The only difference is Holmes rarely has the offense ran through him while Bags actually has plays drawn up for him.
That said, they’ll take minutes from Giles, Belly, Barnes, n Bazemore. It’s premature to think Parker will get more than 10 minutes a night. He can score, but dude is prone to get scored on just as much.
Push comes to shove, I think Luke runs a shoot fast, give up points fast second unit that is anchored by Buddy, Bags, n Parker. They’ll score in bunches, but will also give up points in bunches. Get ready for 115+ scoring games.