If TSER is not re-run and only individual TCER is run, it won't impact on TSER result at all.
It is not clear what you mean by "It is now as stand alone TCER and result.": is it the same TCER included in TSER or not?(from the TCER result's previous results, it would show the previous result when running TSER, is that right?)
If it is the same TCER execution by itself, the defect's link will show the result to be passed now through the icon.
This is related to your question 2: although individual TCER was run(not through TSER), this same TCER should be the one when running TSER as well and all the results should be attached to the same TCER automatically.

Regarding question1, if the test suite is grouping test cases with dependency, then they should be re-run altogether.
If test suite is simply used to group the non-relevant test cases for bulk execution purpose, then it does not matter whether the user runs the specific TCER only as the result will be reflected in the linked test case in the defect anyway.