MVP won't be enough potential for an SF with well rounded skills ;)
If MVP isn't enough potential for SF, it means that his skills aren't well rounded ;-)
Currently superstar is more than enough potential for SF, even to win NT WC or B3. Perhaps MVP isn't enough if You want to create the best player in BB with sum of 10 basic skills over 130 and perimeter skills enough to play as PG/SG in NT/B3 semifinal and inside skills enough to play as PF in NT/B3 semifinal. But in all other cases MVP and even superstar (maybe with high sublevel) is enough for SF.