Evenepoel doesn't have to go in the red to ride others off his wheel on flat/false flat after a hard race. Do you think he was going all out when he dropped Pidcock? Was the snot dangling from his face? Your assumption is correct for about anybody in the peloton, Evenepoel being the exception. There is a reason why guys like Roglic refuse to ride with him, even if the situation is beneficial for him by doing so. If Pogacar only drops him by 10-15 meters, Evenepoel will close the gap on the flat. No ifs or buts. Which is why i said he needs to drop him hard.
Maybe re-read your comments and ask yourself why you mention you mention Pidcock - dropped - after - going - DEEP - into - the - red - on - Redoute - trying - to - chase - Evenepoel (who didn't go deep into the red), while I was talking about the (very likely) scenario of Evenepoel going DEEP into the red / being dropped by Pog on Roche-aux-faucons and if he would be able to reel Pog back in in the final 10K.