Jeff pulled up Johannes's stats for hair growth rate, copied Johannes's stats over to his profile and clicked save. He can hold onto his brother's base settings for a month or two while he learns his lesson.
He then closed out his profile and went back to Johannes's stats, setting everything's growth rate to zero with the exception of head hair, instead he cut that in half ensuring that Johannes will be maintaining some variation of his new look for a whole lot longer than he would expect.
With a smirk, Jeff clicked save on the profile.
Jeff was excited, he had been eager to start growing enough facial hair to actually let it start growing out and experimenting with looks. His brother's loss is literally his gain in this circumstance and Jeff couldn't wait to see what his 5 o'clock shadow looks like.
Despite his excitement, he didn't want to actually provoke Johannes so even though he wanted to immediately let it grow out he would have to "acclimate" his family and friends to the fact that his beard has arrived (finally).
The other option he had was to make it so that everyone but him and Johannes thought this was normal for him all along. If he did that, some might notice that he "shaved" his body hair off but growing out his facial hair wouldn't be strange to anyone except his brother.
Johannes could still easily overpower him, and has already proven that he's happy to do so with no cause whatsoever. That makes him feel unsafe, Jeff began pondering what else he could do to quietly disempower Johannes.