Because he shouldn't tell Carlos that he should never try to steal third with two outs. While a player needs to try that on a limited basis, if a really good opportunity is there, a baserunner can score multiple ways from third compared to second, like say a wild pitch, infield hit, or infield error. There is a reason defenses try holding a quick baserunner close to second base, even with two outs. They understand that a baserunner has less opportunities to score from second base compared to third. No manager in baseball would tell Gomez what you asked for. I'd like to see the run expectancy chart but I would guess there is very little difference between scoring from 2nd with 2 outs and scoring from 3rd with 2 outs. This isn't high school where you have a good chance of a wild pitch or defensive error to score from 3rd. And especially with Gomez hitting at the top of the order he needs to not take the bat out of the middle of the order's hands by getting thrown out. Having him at 2nd messes with the defensive alignment more too as they try to hold him on. So, no, Gomez should never try and steal 3rd with 2 outs.