Deluxe Edition superfluous

The "Robinbsons Rail" is an adventure to share among the adventures of the famous Groom. This is the source of a radio drama, then published to the BD format, but not in the form of a graphic novel. As the Bravo Brothers, this is a crossover between the world of Spirou and of Gaston.
I recommend this successful adventure, but I re-states that this is a novel; it not nintéressera smaller. Then I am not convinced that this edition brings a lot, especially if you already have the volume 8 of the integral Spirou ("humorous adventures"), this edition finally does not much additional information.
If like me you're a fan of Franquin, I advise you for the same price, the reissues of the secondary adventures (like LA Gangsters fair) whose purchase represents a real added value.