Gregorius GB rate is 44% this year. Last year it was 43%.
Now, he does absolutely give up his power right now to try and just put the bat on the ball. When he wants to though, he can bring out the power. It will be interesting to see if either he or someone else can talk him into trying to use it a little bit more often.
Either way though, a strong defensive shortstop who walks nearly as much as he strikes out who also makes contact at a very high rate has more value than I believe you are giving him credit for, especially if we are going to compare him to someone with far less power, more struggles making contact and not nearly the same kind of defense.