Hi JOAQUÍN, no I don't think this topic has ever been discussed before.
I agree it is odd how it is decided what makes a super smurf because as you point out, the butterfly catcher super is no different in terms of accessories to some of the regular smurfs.
Dyar, funny you mention the Traveller smurf as he really is similar to the butterfly catcher. In fact in the past a few smurfers have been caught out by this and have advertised a butterfly catcher with a stick bag as a rare variation. It had me stumped for a while!
I think Gerda is on the right track. There doesn't seem to be a lot of sense in some of the numberings that have been given and also as mentioned, the double numbers for some smurfs and then the very different variations that keep the same number.
I suppose we have to remember that the Schleich numbers that we use today weren't originally issued as can be seen by the release dates and numbers not corresponding for some of the earlier figures and also the fact that smurfs were always produced with being a toy in mind and not a collectible so the numbering system would have been for retail purposes rather than for the buyer / collector.