Sure, and if you needed a leadoff guy we could talk. But I think my batting champion leadoff guy singled in front of my 3 hitter hitting the ball on to the Ryan sounds better.
The 7 inning game makes this pretty ok assuming Giolito has a Lucas-like game. If you can get 6 to 7 innings out of him, then you set up with guys like Foster and Ross to cover most of the nightcap and go from there.
The skill set is there to leadoff, but he just screams #3 hitter to me. You want guys on base in front of him. The power is ridiculous. Let him use it.
I think it is Betts, but if I were starting a team, i would want one of Acuna ,Tatis or Robert so that I could build around them before they got a $30m annual salary.