2001 Saturn L-Series "set timing chain 02 jeep" Questions

timing marks on all three chains were not aligned and had to ALL be set- I guess they might do that to prevent the parts from re-entering the 'system'? Or, some dumb s__t at the factory was new and/or

...timing chain. Base engine concerns can lead to numerous repeating engine mgmt. codes on these, with this system. Then replace connectors as required to enable new sensors to last. Last one I had, had ...