Too bad LZJ failed to convert the two matchpoints in the decider and even lost the deuce to Momota in today's group match of the Thomas Cup. Despite giving up G2 a la Shi Yuqi to conserve energy for the 3rd set, LZJ wasn't as fast and attacking in the decider as he was in the opening set which he won handsomely.
It seems to me LZJ, more so now, has the game to take on KM but not the fitness, endurance and stamina, which is very much required as he has to play fast-paced attacking game throughout and not try to rally with Momota whose controlled game is second to none among his contemporaries. Perhaps accumulated fatigue over the last two weeks or so took a toll on him but, then, all the more it exposes where the problem lies, a shortcoming that partly contributed to his narrow defeat this time, their 3rd encounter in two weeks.
Personally, the strategy or gamble, if you like, of giving up G2 when falling by several points behind in order to save energy for G3, is a risky venture that may backfire, I won't recommend it, unless forced to. As far as possible, it's much better for LZJ to try his utmost to win the match in two straight sets.
So, if LZJ wants to emulate the young Chen Long in his twenties who never complained of fatigue (nor, I daresay, appeared fatigued), or follow in the footsteps of his mentor, Lee CW, for that matter, he must improve on his fitness level, in addition to continuously working on his game.