I apologise if my "of course" has offended you.
What I meant with it, is that the wing formula leaves little room for doubt in this case. Nothing else.
I don't see particularly broad wings or heavy body in the OP photos, but perhaps you were being sarcastic.
In any case, I hope you can agree that the wing formula and the plumage features of this bird all point to Montagu's.
See also the attached composite:
View attachment 1643854