Having more mission guys wouldn't actually be a problem only if it's in Southridge and only being 2 Southridge.1 in pk zone while the other in a non-pk zone. Like how it already is in the more populated island that carries more players. (That's what I meant to say). However, if there were be more mission guys at the more populated island that already has 6, it would be a problem causing the balance to fall in favor for F2P players. Which will then possibly make the game even P2W.
Now the question, are there enough? That goes down to opinion.
Since you put it that, you have a point. Having another Mission Guy in the Southridge would be nice, but two? I think one is enough to fit the whole island, don't you think?