Titcomb is more than just a golfing partner. Before the internet scrub, news reports were that he was soliciting guys and back in their younger days he was part of the Choom Gang.
Hussein’s new buddies aren’t going to approve of the bacon wrapped pork loin.
What’s the Choom Gang?
I can only assume that Bobby Titcomb knows a lot about Zero’s life in HI - who he hung out with, what drugs he did, his proclivities, and perhaps details about Frank Marshall Davis - he was selling drugs at that time. I think Zero is placating/bribing/paying off and maybe a few threats as well, to shut Titcomb up. Titcomb could probably tell a lot of info that would be highly detrimental to Zero. Highly.