Lose to Wei Nan? Maybe , maybe not. But, chicken , he absolutely is not (I know you meant it tongue-in-cheek) - he certainly won't want to beat Lee CW in all the relatively unimportant tourneys only to fall at one of the majors, so he will definitely prefer to maintain his weaponry in tip-top condition for the big ones when he'll be fully prepared and ready to go all guns blazing.
Perhaps, after the gratifying victory over Lee CW last Sunday (only 3 days ago including the 10 hrs flight from Seoul to Kuala Lumpur), he simply felt like he deserved a break and his body and mind automatically unwound a little too much such that he was not able to rouse himself up quickly enough today versus LDK.
That said, I must admit Lee CW is more determined, feels compelled and hungrier to get the better of Chen Long this time in order to redeem himself and, more importantly, regain as much of his battered confidence back. I reckon Chen Long is aware of that (in addition to his own winding down) and it's one of the reasons why he is not too keen to take his perpetual adversary on at this time and place. Really can't blame him for that - you'd be wise to sacrifice a battle, if need be, in order to win the war.
Just saying, I may not be right though; only CL and his coaches know what's going on. As for me, I'd love nothing more than another fascinating,intriguing Dream Final this Sunday; still can't get enough of it now that Super Dan is out of the picture for the time being.