I noticed it too but didn’t even mention it on the pod last night, partially because I was thinking about pancakes, but mostly because the stats boys have refuted it.
I suppose the thinking is that the two free men (one on the front post, one attacking the ball) are more likely to deal with things than if you ‘waste’ one of them on the line. Not sure if these studies take into account our ineffectual aerial challenges though.
I think you are right that the assumption is that you have an above average chance, as most defences seem to, of winning more of the defensive headers.
I wouldn't say that is the case with United and that in the world of all things being equal, we are the exception because we are so shite at winning those first balls.
At some point you have to accept those limitations and deal with them.
No Egan, no O'Connell, no Berge, not that the latter was that good at heading but he did provide height.
So let's assume you want 4-6 of your outfield players to be above 6 foot. West Ham, not a big side last night, had 4. Who do we have 183cm (and not injured):
Basham (1.90)
Bryan (1.85)
Stevens (1.83)
Rodwell (1.88)
Burke (1.88)
McBurnie (1.88)
Mousset (1.84)
McGoldrick (1.84)
The other defenders are down as being shorter - Ampadu (1.82), Jagielka (1.80)
Of those listed, Mousset seems to have fallen off a cliff, with Rodwell clinging to his ankles. I'd argue despite their height, both Basham and Stevens are pretty poor in those defensive corner situations and Stevens did nothing to retain his place last night.
So you're looking at Bryan as the only potential defender with height and heading capability potentially coming in somewhere to help with set pieces.
I do wonder if this now features in Chris' future selection thoughts. Does he need to look at the defence against Man U with Bryan at LWB to get some more height in the team for instance?