There was a bit of a timeline in CCS that I can't be bothered to dig up my notes on again. I think at the end I had them as nearly done with whatever level of school they were in at the series started or something.
I put down the lack of changes in the school year as part of FWR being a manipulative bastard to try to isolate Watanuki because I still believe he's actually the most important character in both plots. That, or the space-time continuum is breaking and it's still FWR's fault that Watanuki et al are stuck repeating high school in a loop (a personal nightmare).
The other ones were already established to be in the same world by crossovers between the works. Legal Drug is set a bit after the end of Suki, and xxxHOLiC is at an indeterminate time in Legal Drug, and Kobato is the same but with xxxHOLiC. There was something I had almost worked out, but now...
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I put down the lack of changes in the school year as part of FWR being a manipulative bastard to try to isolate Watanuki because I still believe he's actually the most important character in both plots. That, or the space-time continuum is breaking and it's still FWR's fault that Watanuki et al are stuck repeating high school in a loop (a personal nightmare).
The other ones were already established to be in the same world by crossovers between the works. Legal Drug is set a bit after the end of Suki, and xxxHOLiC is at an indeterminate time in Legal Drug, and Kobato is the same but with xxxHOLiC. There was something I had almost worked out, but now...