hmm well the "Did Confucius make a difference?" answer is quiet simple. Yes he did, he made a difference by spreading hope and spreading inspirational text.
answer to "Can one person make a difference?" yes on person can make a difference. rather it be a good difference or a bad one everyone makes a difference. a few examples of ppl who make good differences:
Therapysts; athereapyst makes a difference by helping ppl out of suicide or talking ppl threw there problems
Firefight; a firefighter rescues ppl from fires and puts out said fire
Doctor; a doctor saves lives and helps ppl feel better.
everyone can make a difference it takes ONE person to change something for better or worse.