Recruit talent first. If you hire an 8, you've got your baseline.
If you start with a 4-5, it's a lot of hard work, time and money to get them to 7-8.
With the pace and protracted timelines of projectized operations, you don't have the luxury of waiting for people to get "there."
One additional note: this means hiring a team of 8s...not just getting one superstar. Everyone on the team should be of high caliber. Mold 'em together.