Disclaimer: Most info from wiki:
https://en.wikipedia.org/wiki/Battle_of_France
Now, if the Germans had attempted the Schlieffen no2 version the Gembloux Gap seems to be the recognized soft spot in the defense positions of the Dyle plan. Hence the first army would receive help from two light mechanised divisions and with a
Division Cuirassée de Réserve (DCR, Reserve Armoured Division). As far as I understand it these forces (2nd and 3rd DLM?) crashed twice between the 12th and the 14th with 3rd and 4th Panzer, temporarily stalling the German advance and allowing the French to dig in at this part of the front.
Now, I know this is tat the hard of no sickle-cut discussion, but as I read it, this was a predictable crucial part of a "traditional" German advance and this was what the French threw at it.
What if the advancing French forces had been hammered from day 1 by the full might of the luftwaffe and when the French arrived (late?), they would be attacked by 9 panzer divisions (7 moved from the Ardennes offensive IOTL). Would they not then have performed if not a sickle-cut, then a sledgehammer breakthrough?
If not, then why not because the odds seems stacked against the French at least at this particular place