I think you have provided some nice coverage and probably can speak to Dantes peformance better than most here, but what were his minutes per half? If I recall seesm like they benched Dante for the Vets in the second half, right?
With the exception of the last game(which I didn't watch, just followed the boxscore, and in which he had less minutes towards the end), I think his minutes were relatively evenly distributed. He's played about 81.5 minutes in the 4 games so far. He usually starts for about 6 minutes then he's given rest for the remaining of the first quarter and he doesn't start the second one either. He usually gets in at about 5 mins of the second quarter. Then he starts the second half and plays for about 5 minutes and is then rested on the bench and depending on how his play is going, he gets about 4-5 minutes in the last quarter as well. I don't have the exact numbers, but if I had to guess I'd say he's playing about 11-12 minutes in first half and about 8.5-9.5 in the second.
I don't think Gibson is better than him for sure and I don't think Dellavedova is in general better either, but his level drops towards the end and I think that's why he gets less minutes towards the end of games.