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gintoki created a topic of Link Click

There are like 4 fans of link click so I’m sure no one will read this, but I have some doubts about season 2 ending

1. Since when can Lu Guang enter the photos? Was it explained during the donghua and I just forgot about it?
2. In the timeline where Cheng Xiaoshi dies, do we know when and how he died? Because he was wearing the jacket he used to wear in early episodes so I assume he was supposed to die a long time ago, which leads me to my next doubt…
3. If Lu Guang is changing the past by traveling through a photo then isn’t he supposed to only have 12 hours to do so? Or is that just a restriction that only Cheng Xiaoshi has? If the latter is not the case then is bro dying in 12 hours or what’s going on?