aku ga pernah pakai skript dan kurang tau tentang skript, cman pas liat kode mu, seharusnya itu ga perlu console yang execute buat gantiin gamemode si player, mungkin itu bisa diubah pakai:

set gamemode of arg-1 to creative
set gamemode of player to creative

Why making the console to execute the default gamemode command?
do you know you can do it via skript?