Karrigan could very much improve Broky gameplay, thats Karrigan specialty, hell in the ideal world where this trade happens, i think mouz doesnt lose out that much IF Broky can fill in the same roles as chris does, but even then i wouldnt call it a final solution, it would surely add some firepower but Mouz firepower is the least of their problems when you have one of the faster AWPers in the world, probably the best wing player in the world and a very good Clutcher all 3 with incredible talent, adding even more talent will make them more lethal, but raw firepower isnt what will beat a rigidly structured team like Astralis or Vitality when their gears start turning like at EPICENTER, to beat these Structured teams you need firepower AND smart playing, which ChrisJ can do, he has a lot of experience and a great sense for what plays will coem to him on CT side, but still broky raw aim could compensate.
I think that FaZe would lose out, because yes, they need an AWPer and an IGL but it is sad to say that ChrisJ's primary AWPing hasnt been used for more than 2 years, hes a great secondary AWPer but his T side AWPing wasnt that impressive even when he was a main AWPer for mouz, lately he has been way better on rifles, but a weak main AWP could still be servicable when surrounded by individuals like NiKo and Coldzera, the problem becomes another one, or rather too, first problem is that Coldzera will be at a loss of a personal info player, you suggested Rain to get that role, but Rain never played sacrificial roles(i would see Olof better in an info position) and youll be wasting Rain great CT sides, it will be hard for Coldzera to make another dynamic duo with another player from FaZe, but thats an hypotetical. The real and fat problem is that ChrisJ has never IGL'd once in his life, according to Karrigan Ropz is the one doing mid round calls because of his lurker positions and he has never been a decisional player in any Mouz lineup, because that was never his role, he always was a system player that filled in what the team needed, assuming hed be good at IGL just because he has experience isnt something you can do, we saw what happened when Shox thought he was experienced enough to become an IGL out of the blue, again it could come up that Chris is a great IGL but if you are playing for almost 7-8 years and never IGLd, i think its because he himself knows that.
If Chris fails, i doubt itll be because of Ego, Chris has always been known as a great teammate and he played with a ton of different perwsonalities, NiKo included, i think that a ChrisJ FaZe lineup will fail because ChrisJ just could not work as IGL and his AWPing too weak.
This move could work, but I think that way too many things would have to work out for a gain a bit too little, personally as an IGL/AWPer for FaZe(taking out Olof post-Major) i would choose either CadiaN, a very solid AWPer that has been improving visibly as an IGL in tier 2 play and I would even dare to say that his AWPing is very good for an IGL, his strats arent overly complicated but could work out very well with the kind of firepower FaZe has, or ArT, which is an unconvential IGL, he has good AWP mechanics and has a very unique style of play, if he can utilize Broky as an info machine like he does with VINI and Coldzera as a superstar clutcher with the rest of the team playing very aggressively, i can see it working very well as it could bring back NiKo to his Rambo CS days and make Rain CT sides even more potent, i can definetely see FaZe as a FURIA on steroids, this last choice is really experimental but i think it has basis to work out very well