in the german version this is a rule even, in case of withdrawal, the last eliminated couple gets brought back to the competition
when Jimi Blue Ochsenknecht broke his knee (my favourite that year
) Barbara Meier and Sergiu Luca were reinstated, and they went on all the way to the final to 3rd place
or when John Kelly had to withdraw due to a death in the family, our Loiza Lamers was reinstated, and lasted few more weeks until week 7
or when Hardy Kruger Jr couldn't dance further due to covid-19, Princess Lilli was reinstated after actually been eliminated in week 1, she survived one week on public votes, after eliminated on week 3
this is just most fair tbh, to do everything for a most competitive series