Perhaps you've signed a couple of diamonds in the rough (Luna and Cabrera) because of the scouting resources CFG has at its disposal. That's where City should hold a competitive advantage, because we know for sure that CFG aren't going to spend more on marquees than some of our rivals.
There's also no point in making any judgement calls on these two "unknowns" before they've played a game. The best players for us (in the CFG era) have pretty much all been unknowns before arriving here, so if anything these types of signings should excite City fans, not disappoint. Especially considering they've signed this far from the start of the season!