I'd hope he doesn't cost a 1st. Alex Smith, who was a proven QB, got 2 2nd's. Something doesn't add up with a 1st for Cousins and Smith not even getting that.
And I wouldn't say Geno is better than McCaron. Maybe he has a stronger arm, and more raw talent, but McCaron is a much smarter football player. We're talking about a guy who lost 3 overall games as QB in his tenure... and i'd say at least 2 of those losses came because his defense couldn't stop a nose bleed. He's a guy used to success. He was trusted by the best college football mind to run his offense on his own by the time he was a senior.
Sure, you can look at him last year, and claim his success was derived from a strong running attack. And then I'll look at you and tell you that's exactly what we need isn't it? He managed games well. He didn't make many mistakes. He didn't put his team in a bad position. And he made the big plays when he had to. Rex wants a strong run game coupled with a competent and smart QB.
McCaron exemplifies that better than Geno, the gunslinger, who can read defensive schemes at a slightly better efficiency than Sanchise.