I’m not sure that’s an entirely fair summarisation of what’s currently still ongoing.
Rob and Doug (and a handful of others) started Grant Naylor, the company which produces Red Dwarf and which holds the rights together. Though Grant left the writing partnership, he remained (and remains) a partner in Grant Naylor, the company.
The contention of the other Grant Naylor partners was that Doug Naylor was compromising the financial security of the company for which they all shared responsibility. They stepped in to prevent Naylor from doing so. In retaliation, Naylor accused them of not paying invoices he made against the company going back to 2018 and right up to the pitching process for the two further specials to follow up on The Promised Land.
Grant and Ed Bye have publicly stated that it’s in their financial self-interest to continue to make Red Dwarf (and it’s only a handful of years ago that Rob came back to participate in the Red Dwarf AA adverts, which led to brief hopes of a re-coupling of the writing partnership) but the way Naylor was doing it meant that, as said above, the financial security of Grant Naylor wasn’t secured. So they, as a group, had to step in to protect their company.
Since then, Naylor has started proceedings petitioning the courts that he be awarded the sole rights of Red Dwarf. Which is barmy.
I don’t think there’s a good guy or a bad guy here. But there is an element of obstinacy on both sides.