I don't care if United play 4 players with more offensive roles than Pogba, or 5, or 6, or play him at centerback. Pogba is at his best when he's given the freedom to roam and improvise - he thrives on that, and that sense of tactical freedom is why he emerged as an elite player at Juventus - where Vidal/Khedira and Pirlo/Marchisio provided the platform for Pogba to excel as a dynamo, and the same is true at United where he's evidenced an upturn in form and offensive contributions with the backing of Carrick and Herrera. Whereas Griezmann hit his Atlético peak with deep central midfielders (iterations of Gabi, Tiago, Saúl) - who sacrificed a lot in their games, pressed and harried and with a tucked in Koke, laid the groundwork for him to pick his spots behind the lead striker - that just doesn't work well with a roamer in Pogba.
The classification of Pogba as a generic 'central midfielder' and Griezmann as a generic 'forward' is why their roles are misinterpreted. The same happened with Gerrard (another player who thrived on tactical freedom) when he was forced into a generic central midfielder role at Liverpool until the arrival of Benítez - who surrounded him with Alonso and Mascherano - which liberated Gerrard:
Champions League final where he helped revive the team after Hamann's introduction in the second half (after they got sliced open and were trailing 3-0 with Kewell playing as the 'forward'):
Strongly disagree with the 'major indictment' part wrt. coaching ability, too - it's not as simple as chucking two potentially great players into the XI and expecting the manager to find a way to play them at their highest levels, especially when they don't evidence workable synergy for France - relative to each player's best level. It would be akin to forcing a 'central midfielder' in Gerrard and a 'forward' in Kaká into the same areas, when they're bound to overlap unless Gerrard is curtailed, or becomes more tactically aware (Seedorf in Milan's Christmas Tree).
Disagree with the Griezmann on the right part, too. We have Mkhitaryan who transitions into central regions, and adding someone who offers decent creativity (but not great) and is also a good but not great dribbler in Griezmann on the other side will severely curtail the attacking potential of the team. It's not comparable to Messi and Neymar at Barcelona either - because they're both among the most creative players and dribblers in football (especially in comparison with Griezmann).
Also disagree with the last part. It's not just about playing someone who's more disciplined, it's often a numbers game in the crucial central areas of the pitch - you're still going to ask Pogba to track back more than he should, and most importantly - isolating the central midfielder (something we saw in the City game where we were all over the place from a tactical perspective as Pogba surged forward, and improved substantially with the introduction of Herrera as the midfield third).
Not to mention, De Bruyne had a field day in the spaces behind Pogba, and Mkhitaryan was forced central because we just couldn't handle their midfield in the first half: