After the call with the Star Lord, Jacob fell into silence. He was thinking about what the Star Lord had just said, and he couldn't believe this was his plan all along. Nonetheless, he somewhat agreed with the Star Lord's plot and even felt slightly appreciative of the guy for giving him this unexpected opportunity.
Furthermore, he also starts to interrogate Anonymous Star1 to get more information out of him, especially about his relationship with Star-Lord and why he would trust him over the others.
It turned out that Anonymous Star1 couldn't refuse Star Lord's commands or go against him because he was poisoned when he was anointed as Anonymous Star No.1 by Star Lord.
This poison was so deadly that even three steps of legend experts would die if they didn't take antidotes in short intervals. Not only that, but this poison seemed to be incurable, and Anonymous Star1 needed the antidote every three months, or he'd die a gruesome death.