I think people forget how truly awful the Aminu/Harkless drives could be if the ball swung to them and they didn't have a wide open 3. It was usually just awful. While RoCo and DJJ aren't the greatest ball handlers in the world, their slashing ability and decision making after they take off are much improved from the bad old days of Aminu/Hark.
		
		
	 
Maybe
Last season, on isolation, Covington was in the 94th percentile, but it was only 2.4% of his possessions (in Minny). In 18-19, Aminu was in the 83rd percentile and it was 3.4% of his possessions. Harkless was only in the 4th percentile. Jones didn't do it enough to be listed
but those are such small percentages of individual possessions I don't think the sample size will have any significant impact
more importantly, this is Dame's team and as of yet, Olshey hasn't signed a backup PG. So then, we'd need to look at how these player fit with Dame and what Dame is a master at is the PnR. So then, right now I'll look at these players and 
how they performed as PnR roll men:
Covington - Minny - 79th percentile - 3.5% of possessions
Covington - Houston - 44th percentile - 7.8% pf possessions
Jones - Miami - 95th percentile - 8.7% of possessions
Aminu - Portland (18-19) - 93rd percentile - 4.5% of possessions
Harkless - Portland (18-19) - 35th percentile - 2.4% of possessions
another play-type I've been seeing talked about here, cut:
Covington - Minny - 16th percentile - 7.1% of possessions
Covington - Houston - 72nd percentile - 3.4% of possessions
Jones - Miami - 82nd percentile - 18.4% of possessions
Aminu - Portland (18-19) - 31st percentile - 10.3% of possessions
Harkless - Portland (18-19) - 81st percentile - 17% of possessions
I'm not sure how synergy categorizes plays, but I'd think Nurkic would be as important in cuts as Dame
all-in-all, the new duo might be a little better than the old duo, but I don't think there's as big a gap as some are implying.