I'm 2 pages too late, but just my .02 on the Human Smoke-esque morphs for other characters:
N64 MKT showed that C.Sub could be passed off as U.Sub just by removing a sentence in his bio, and quite frankly, he was only ever included as a 'hey, why not' in UMK3, even then, Midway themselves could've given him the H.Smoke treatment and some other character their own legit character slot. I don't see a problem with giving them a morph for each other.
An Ermac>Scorpion morph is reaaaaally stretching it though.
On a lulzworthy/probably completely useless note, I wonder if MK3 KaNoob is still in there or if he got sieved out with the other vanilla MK3 data...