This article contains lore created collaboratively by the Blaseball community. It is just one of many Rumors that we've found in the Interdimensional Rumor Mill. You can find more Rumors about Brock Forbes at their Rumor Registry.
Both Brock and Axel Trololol are superbly chill individuals, who are very good at going with the flow. They get along superbly well whenever they are around. However, if the rumors are true about Axel being a metaphorical time bomb of amoral power-hungry sheer will, it makes more sense as to why the two of them seem so close. While the Crabs as a whole have taken on the reponsibility of being Axel's moral compass, Brock in particular would have jumped to the role with great interest, not out of a place of doing what's right, but out of the pragmatic sense of keeping an eye on a dangerous individual as the de-facto protector of the Crabs from monsters not unlike him. The two of them are good friends, enjoy one another's company, invite each other over to chill, and are fully prepared to kill the other if it comes down to it.