Every scouting report I've read on Torres seems to indicate he'll stick at SS. He's not going to be Lindor there but most seem to think he's average defensively though given they Yankees have Didi Gregorius who's a superb defender I could see them moving him off SS. That being said, if I'm not mistaken the yankees moved Mateo over to 2B rather than Torres after the trade. Presumably if Torres were that poor at SS he would have moved.
As for Eloy, I don't really agree with that assessment. First of all, all the scouting I've read on him is that he probably should be playing LF. And more to that point, the cubs themselves played Eloy 741.0 of his 833.0 innings last year in LF. As for Heyward, I'm not sure he leaves even if he does rebound but if we humor the argument, Eddy Martinez is a legit prospect and a far better defender in RF. Hell he can probably play some CF and given they dealt Dewees this offseason he might actually play there this coming season.
I get why people like Jiminez. And I get why you wouldn't want to trade him. But we have seen this offseason what pitching costs. If the cubs are actually hunting for pitching at the trade deadline, every team is going to be asking for Happ and Jiminez as the head line pieces. That's just the way it is.