Guide
Oxfords tests are better than not doing any tests, but like any test of leadership its down to the assessors individual interpretation of what is good or not. Granted the assessors have been selected for a reason and have assessed many candidates, but nobody is perfect.
Don't forget, some idiots get through (I know of quite a few during my time at OAA ) and some very good candidates don't. It's a guide not a rule.
If an airline looks at your initial assessment I'd be amazed. They just care what your final report says. In fact they don't even see your initial assessment.
Go back, do it again but have a look for some tips on leadership (even if its just lip service).
You passed the important bits, such as the aptitude and interview. Take inspiration from that and get onto an ATPL course while the going is getting good!