I think Lu Shu Yin wins this
At the start of the match, he'll use the Purple Gem Stone while having the Gemini Twins by his side then looks at all of Straybow's information, letting him know the effects of any of his moves -
https://imgur.com/a/8gdEDUf
Then he'll use another of his Gem Stone, which should be the Red Gem Stone at this situation since the others are situational based and he knows how to form a plan based on the situation
When Straybow tries to attack him, he'll know the areas where Straybow's attacks will land and how dangerous they are by the time Straybow tries to use them cause of the Purplen Gem Stone analyzing him -
https://imgur.com/a/yfWks3Y
Then leave the areas before he gets hit by the attacks, in which Straybow can't even react as the Purple Gem Stone could let him move around countless times before anyone could even react -
https://imgur.com/a/5ZBy32E
Within that timeframe, he already has the Gemini Twins transformed into a Dragon then she'll just use the Breath + Sound = Crystal combo, making Straybow into a Crystal, killing him when Lu Shu Yin decides to break it
or
he could give the Gemini Twins the sheath of his Machete to protect themselves from the Machete's Mercury after using the Red Gem Stone, then spread the Mercury from the Machete around the area, which will force Straybow to faint -
https://imgur.com/a/YtKTUdN
Even if he doesn't faint, Straybow will be digesting the Mercury, which will let Lu Shu Yin cut his body into pieces from the inside -
https://imgur.com/a/wzXjWrF
He could do it to the Blood Shura's Arm which was stated to have incredible power, so the Machete being sharp didn't have any play into why it got cut off, but the Mercury from it did -
https://imgur.com/a/cmk7Cvb
Using the Purple Gem Stone can pretty much let him move around without Straybow knowing where he's at, so it with the Machete is a good combo