Some of the evidence was obtained through Jasmine Hayes, who helped them resolve their troubles.
With this in hand, even if Vincent Holmes wanted to protect Jasmine Hayes, it wouldn't be easy!
Although it wasn't something done by Jasmine Hayes herself, if the news got out, the impact would be far from good!
The reason why Tiana Williams directly gave these things to Xaverius Holmes was mainly to have the board of directors handle it internally. That way, DK wouldn't have to bear too much risk. She didn't want DK to go under; after all, it was her grandfather's hard work and would be left to Luther Holmes in the future.
However, Jasmine Hayes and Vincent Holmes must be removed, and they had to cough up everything they had swallowed over the years. Therefore, choosing those close to Jasmine Hayes, and having the insiders at DK take action, could achieve a twice-the-result-for-half-the-effort effect.