I didn't think about it, but you're probably right... But I really think it's not clear in the rules of the contest. A gradient may be between two colors only... But all the field between them... Does it count? I'm not really sure...
I've submitted two emblems with gradient but, thinking you may be right, I'll submit my last one in solid, just to be sure.
EDITED: I've changed my second submission in solid colours too.
Regards!!