A lot of variables, but if talent is equalized, coaching would have a great impact on the outcome of games. Player development, scheming, and situational game management would be the difference given comparable Jimmy's and Joe's.

At some point numbers, size, and talent will prevail in the W/L column. But by in large, most high school kids are competing against other high school kids that will never sniff a college field. If you can tap into maximum effort and get out of a kid their highest athletic abilities, that team will generally prevail, or at least be the best version of themselves.

I give the coach credit for conditioning, coaxing, teaching, caring, and encouraging before adding the play-calling and strategy that affects the outcome of the contest.

It really depends on the situation. Some teams are really talented but, the coaching is suspect. You can always tell when a team is talented and when the coach is a good coach.