I think Cola was pretty bad last year but it looks like he has improved defensively. How much? Who knows but the more the season goes on we will find out.
They have a bunch of data at their disposal so it would be naive not to use it. You can use the catapult system to see if he is fatiguing or not and since other players on the roster use it I'm sure they will put it on Sanchez too.
I'm not worried about Donaldson but Tulo does scare me a bit. I think the power numbers come back but last year his strike out rate surged and nothing I've seen this year (including ST) makes me think its going to change.