And it is this level of fore-thought and control placed in the Mission GMs is great to see.
But there is still (sometimes) a dynamic fault that can happen
For example, four highly "optimized" characters and one "Real RP" character..... Depending on what that character is, a good GM can help. If the "Real RP" character is the only arch-type there (the only awakened, the only rigger, the only decker) out of the group, a good GM can kind of insulate the weaker "Real RP" character and his much lower dice pools then he can if he is one of several front line combatants, or awakened.... Then you end up in struggle of balancing the player, VS the table
Sadly only the really Great GM can pull this one off on a regular basis.
(And no, I am NOT one of them!)
Sadly, you can only do so much with a living campaign. If this were D&D or Pathfinder, sure, it's easy. You have some control over how much money and gear characters get every level, and thus have a solid gauge of the power of a group of characters, though an all mage or all cleric or whatever group can still throw things outta whack a little. But it's not really that bad.
But with a levelless game like Shadowrun with a LOT of moving parts for characters to play with... yeah. you just kinda gotta throw your hands in the air and hope the GM can roll with it. Sadly, not all handle it as well as others, but that's ok.
hopefully most players participating in Missions understand the limitations, and can just roll with the sitch as it comes up. At the end of the day, you'll have one of a couple outcomes:
1) You get the drek kicked out of you and spend/burn some Edge. Edge is a lovely failsafe to keep your character alive. And you should have some fun stories to tell. I know most of my best "Bull the Ork Decker" stories usually involve Bull getting tormented by the GM and usually losing body parts and/or expensive pieces of gear. (This was mostly 2nd and 3rd ed, so before Edge. And the Hand of God rule was kinda brutal, so fortunately we almost never used it.

2) The GM can handle things, and you have a great time as a well-integrated member of the team. And even a starting, out of the book sample character can usually hold his own with a group of Prime Runners. Those characters mostly don't suck.

3) And lastly, worst case scenario, the GM isn't able to tailor the game well to the power differential, and you coast on the tails of your more powerful teammates. unless they're a bunch of jackholes who dominate the game though, you should still be able to Roleplay and have a good time (And if they are dominating, talk to the GM and/or the event coordinator, because that's violating
Wheaton's Law). And hey, you got an easy bunch of cash and karma out of it as well.
