The only time strength of schedule doesn't come into play is for those teams that are limited travel-wise by finances and/or state rules.
As for that one year with Riverdale, I was not happy naming them No. 1, but they were unbeaten, Tennessee was strong that year and they did play some out-of-state games. PVI plays in the toughest league in the country and also plays some major events.
If Pinewood goes unbeaten, not only will they be in the top 25, they'll be in the discussion for the national title, because they will have won California's Open. And if they beat Carondelet and Salesian, they will move into the the top 25, I would imagine, and then be poised to move up if they keep winning. But right now, they have the one good win, though winning the Platinum at the Jamboree would also be a big plus.
Southern California is stronger, as is usually the case, as Redondo Union's win over SMS shows pretty definitively. And even though O'Dowd didn't have Holland, note that Long Beach Poly is 4-4 and lost to Etiwanda and Mater Dei badly, so the Jackrabbits are not elite.
Eventually, the discussion about Pinewood will be settled on the court, luckily, and it would be great to see them roll through the rest of the schedule and challenge for No. 1.