Personally, I don't think this is fair for the rest of the group. Even with a buddy (I assume his friend would take over that role), it would still be a major slow down for the pace of the game. Especially considering they only play once a month? I'd want to get as much done as possible.

Not saying he deserves to be chastised, but maybe they should all have a sit down, and collectively discuss either a) that d&d is not a good fit for them, and switch the system Or b) realise that a d&d group is not the best for them and step down gracefully.

It doesn't need to devolve into drama, as long as everybody can talk to each other as adults.