Nope, you're wrong. Check out the scores, it was a blowout win.
For a more accurate image of what happens when you set one player as starter, and the other as backup + reserve, check out for example this game:
(72615137)I badly underestimated my opponent, and nearly lost what should've been a very easy game. I decided to play a trainee for 48 minutes at PG (note the 4.0 rating), and every other position was covered by two players - the one with higher minutes was starter, the other player was set as backup + reserve. The scores stayed close throughout, so the players followed the usual substitution patterns.
I have been playing since Season 17 with this team (after having about 2 seasons experience a few years prior), and am on the threshold of possibly promoting to the top division in a competitive country like Australia. Please, don't lecture me about experience.
I can give you dozens more examples if you like, but I'm sure it would also do you good to hear from other experienced managers - setting a starter means you'll be planning on playing him about 35 mins a game, possibly 40. There is no other way in SFDC.