RM is the leader of BTS

The argument

RM, also known as Rap Monster or RapMon, is the group's leader and its main English speaker. As the leader, RM is at least partly responsible for the band's huge worldwide success, not in the least because he writes and produces many of their songs. Additionally, because RM is the only band member who speaks English, he is responsible for communicating with English speakers and translating for the group. As an indispensable asset to BTS, RM is clearly the best band member.

Premises

Counter-arguments

RM is not the only member of BTS to produce the group's music, and he is certainly not the only member to write their songs. Other people in the group lead in different ways: J-Hope helps the group learn new choreography, and Jin is a regular source of advice since he is the oldest. RM is not the only writer-producer, and he is not the only leader either, so he should not be considered the best in BTS for those reasons.

Rejecting the premises

[Rejecting P1] Leadership and partial credit for the group's success are claims about a role rather than about who is best. The premise's own hedge — "at least partly responsible" — concedes that the success is collective, which argues against singling out any member, and writing and production are shared across the group, as the counter notes. [Rejecting P2] English fluency is a fact about the group's circumstances rather than a musical merit, and it measures usefulness to an anglophone audience in particular. On the argument's own logic the criterion would have picked a different member had the group's international attention arrived from somewhere else. [Rejecting C] "Indispensable" then does the work "best" cannot. Being hard to replace in one function is not being the best member, and the position needs a comparison across what the group is actually judged on — vocals, rap, dance, writing and performance — which the premises never attempt.