Why was the bloody gangster Luca killed?

Before the boxing match, Solomon's last words in the wine cellar thought that Solomon would join hands with Tommy to clean Luca.

When Luca went to the wine cellar to sign the transfer contract, Tommy knelt down and thought that the Shelby family would focus on John of new york next season. It developed to call back to Birmingham in the later stage, and Arthur did not die in the end. Tomby went to Solomon. When I raised my gun, I thought it was a joke to let Solomon make wine for him (because Solomon is very good at tasting jewelry). Mainly gin and Russian eggs remind me. I didn't expect them to be more cowboy duels. Solomon died under the blue sky, sea and white clouds he wanted.