Multi Man Melee Secret

[qwertz143]

Did you know in the multi man melee in cruel melee (Didn't test for the other ones) if you retry by pressing Z with Fox, Falco, Donkey Kong, Link, Toon Link, Ganondorf, ZSS, Meta Knight, Dedede, Olimar, ROB, Snake, Sonic, Ike, Marth or Roy the stage switches to the alternate melee battlefield?
I wonder why only these characters were allowed to this?

 

[Xermo]

This is an ASL related quirk, not a secret.

 

[qwertz143]

This is an ASL related quirk, not a secret.

So is it just a mistake that the ASL doesn't choose all of the characters for the stage? Or were alternates for battlefield not supposed to be chosen at all in Multi man melee?