Forum:Daigusto and Gustos

I was always wondering a few things, but roaming google/the internet I couldn't find them. For Daigusto Gulldos/Caam Serenity of Gusto.. Their effects require you to return to Gusto Monsters from graveyard to the deck. Here is where my question come from. With the change in Hidden Arsenal 5 "deck" to "main deck" on both these cards.. Does that mean you can't return a Daigusto monsters as part of cost cause they would return to the extra deck? Cause I have heard that Daigusto count as Gusto, just like Roids have parts in front of their names. But why change it to main deck on those cards listed up there text. Please if anyone has any knowledge or anything please let me know. Simple version of above: Can I return Daigusto monsters to extra deck for Caam, serenity of gusto and Daigusto Gulldos, even though they say main deck?