To my knowledge, no extra runs are given for an extra long homerun. But it is easier to hit a routine fly ball than a homerun, and with increased exit velocity, more of those cans of corn will clear the fence. Also liners and grounders are more likely to find a hole if they get there faster. So he may still benefit from more refinement, but hitting the ball harder does tend to lead to better results and more runs given a similar contact profile. As to the over all question, the other core Twins would also get tendered or not based on the talent behond them. They still could get traded, but with their contracts, it would need to be a really good return.