Warning: this is half off-topic. But anyway...
Consider the most important federations/leagues in CEV, they are IMHO
Italy, Russia, Turkey, Poland and Serbia.
Now look into the internationally well-known and respected Corruption Perceiption Index (CPI) of Transparency International; a value below 50 means it is an overwhelming corrupt country (this is no volleyball specific issue, you will find similar results in other sports too):
For your comparison, the less important countries Germany and France have values of 80 and 69 respectively.
Therefore Boricic is from a country, where the people are used to widespread corruption.
There is also a story I learned a number of years ago: the CEV decided than, that in CL all libero players have to wear a green shirt. When Stuttgart startet in the competition, they had still no such one, but used the formerly and used in other competitions. I learned, that the CEV chosen company was not capable to deliver in time, it was some weeks late. And that this company belongs to CEV president Boricic. Now you can build your own opinion.