Publisher issued 2 volumes into 1 in just a small part of a huge series

[André]

I've previously asked for help in a similar topic of this one (https://www.goodreads.com/topic/show/...), but now I need it again, hoping for a different answer, maybe...

In that topic, the Brazilian publisher had split volumes 2 and 3 of a series into volumes 2, 3 and 4, and then someone suggested me to create a new series. No problem there, except for a pending question about how to use the "combine" feature in that case. (help with this is still apreciated)

Now, however, I have this situation in which the same Brazilian publisher had merged only volumes 26 and 27 of a 50+ volumes series into one. I have combined the "merged" Brazilian edition's volume (https://www.goodreads.com/book/show/5...) with original edition volume 26 (https://www.goodreads.com/book/show/1...), skipped original edition volume 27 (https://www.goodreads.com/book/show/1...), and then combined Brazilian edition's next volume (https://www.goodreads.com/book/show/5...) with original volume 28 (https://www.goodreads.com/book/show/1...).

I've also pointed the 2 volumes in the title of the "merged" Brazilian edition's volume ("Pokémon Emerald, Vol. 01 (Pokémon Adventures, #26 and #27)")

Was that all correct? Should I have done something differently here? And regarding the series, should I have created a new one (with all the 50+ volumes when they are all released) just because of this single volume?